Charged for failed self install even though it was outside cable issue

Question

Recently I moved and opted for self-install. I did all the set up correctly on my end but was still not getting internet service. I called and a technician was sent out and the technician also couldn't set it up because he determined the issue was with the outside line. He told me another technician would need to come out, at no charge to me, to run a new wire into the apartment for me to get service. The second technician came out a week later and did the work and again, no mention of charges for services was given or indicated on the receipt I was left with and signed. Sure enough I check my bill this month and there is a failed self-install fee of $100! I talked to customer service in chat and they said the best they could do is $30 even though I was told I would NOT be charged for the 2nd technician. I was also told that $50 service charges are mandatory whenever someone comes out, even though this specific charge is for a bogus failed self-install and not for a generic service visit. It wouldn't be so much of an issue if the first technician had just said "by the way it will cost $100 for the 2nd technician to install the new wiring from the cable box" instead of telling me it would be free. Why can't the technicians and service reps just be up front from the begining? This has been very frustrating. I still don't see the $30 credit and I should be getting a FULL credit because charge is completely bogus and the technicians should be trained to explain in advance all fees for services 
BEFORE I authorize service.

Answer 1

@rick_a_shae
I am sorry for your troubles. I have sent you a private message to assist you further.