5 months 10 engineers, 2 cables and still no fix

Question

I’ll try and keep this short, end of May our line developed intermittent noise and broadband loss problem, worse when it rains.
June and July were spent with BT and our ISP trying to blame each other with us in the middle getting the hassle.
Eventually BT seemed to accept it being a line fault and August and September has been spent trying to tie this down. Last but one visit our drive and path was dug up to lay a new cable. 10th engineer arrived yesterday fitted new cable. As usual the fault was not there when he left. Then it started raining 10 minutes after he left, now it’s worse than ever.
We have had a next to useless phone and very little internet access for 5 months which we are paying for.
We have had to stay in for 12 days for engineers visits, 2 of which never turned up.
I have lost count of the hours spent on the phone (when it works) trying to resolve this issue.
And still we have the fault
All this has come at a time when we really need reliable communications due to family matters and BT have persistently let us down so much so that we have both bought Smart Phones for Internet access and reliable communications. I have also bought a Mobile internet dongle for PC internet access. Therefore we are now paying for our communications twice.
So could someone at BT please tell me what are the benefits for me continuing with my unreliable BT landline?
Personally I cannot see any benefits but only more hassle, expense for a poor service and more time off waiting for engineers who may or may not turn up.

Answer 1

Thanks for the reply Stephanie I shall email our details as requested
Just to put you in the picture the 11th engineer came out to have a go, it looks like it may be sorted.
The fault was not the cables which previous engineers had renewed (the fault came back even with the new cables). The fault was actually the ducts through which the cables ran were flooding, hence the fault getting worse when it rained, but my telling BT engineers and customer support that we have had this problem 2 years ago (we were had about 5 weeks of hassle then) was ignored.
Anyway, after the 11th engineer visit fixed OUR fault he left the nextdoor neighbours disconnected. They are in their 80s and need the phone for contact with their family etc. So even though our phone fault was sorted I still found myslef having to go through the pain of the bt fault reporting procedure for the nextdoor neighbours.
OBTW It took a week for a BT engineer to come round and fix the neighbours phone which a BT engineer had cut off in teh 1st place. 
What a debacle!
I now still have to decide if I am to cancel our contract with BT because over the past few years we have been cut off or had faults on our line on average of every two years. So every two years we have all this hassle, time expense and stress.
Yes stress, it may come as a surprise to the powers that be at BT that the fault reporting and repair services leaves alot to be desired and the amount of time and frustration we customers have to face trying to get a service that we are paying for is very stressful especially when BT protract the fault over 5 months.
Things have improved a little from 2 years ago however, the new priority fault team (I dont know the full title) who get involved after 4 fault reports have been helpful (Cath especially) but even with their help it has still taken 5 months.
Regards
PJ2000