Getting the dial tone on my landline using a DECT ...

Question

This issue has been ongoing since April 2012. If I use my Panasonic DECT phone (bought in 2006) to make or receive a call, the BB connection drops within 5 secs (Home Hub 2.0).  I had a Voyager 220V for 6 years working alongside this DECT phone and all was well. 
I had to call BT Faults in April because suddenly my BB service kept dropping out up to 6 times every half hour. (unrelated to the phone at that stage).  BT Faults Level 1 (India) said the Voyager needed had come to the end of it's life and needed replacing with a Home Hub 2.0.  They also said there was a software issue at their end & it would be sorted within 24 hours!!!.  The replacement Hub worked with my DECT phone for less than a week before I noticed whenever I made or received a call the BB dropped out after 10 seconds.
I called BT Faults about the issue of BB dropping out when the phone was used, but it went on for weeks with BT not getting to the nub of the problem.  They did their usual tests and in July they sent an engineer who swapped the hub over, ripped out the existing ADSL box, put in a new SSFB box (no filters required), tested and all was well for..... 10 days.  Then the old problem returned. I checked with my phone company about compatibility issues, but they were unable to help. (after all the phone had worked for 6 years alongside the old router).
I wrote to BT complaints and in Aug 2012, they sent yet another engineer who this time ripped out the existing internal cabling just outside the front door of the property (star wiring) and put a direct line in from outside, telling me that this should rectify the problem!!!   Another Home Hub 2.0 was tested and appeared to work compatibly with my DECT phone. Within 3weeks the old problem had come back.  BB drops whenever I get a dial tone or receive a call.
I've tried swapping over locations for the Hub and phone (at least 5' away from each other), swapped over power sockets, isolated all electrical devices using the same power socket, connected the Hub and the phone only to a different power socket. I'm fast running out of options.  BT Level 2 Faults will call me on Mon 24 if nothing has changed they want to send another engineer who this time will charge £110 no doubt & they still can't get to the bottom of the issue. 
If you've been through something similar and can offer suggestions, anyone please?
Wits end!
RR
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Answer 1

Hi Keith
ADSL stats as requested.
RR27
ADSL line statusConnection information
Line state
Connected
Connection time
0 days, 1:15:52
Downstream
4,459 Kbps
Upstream
888 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.3
Latency type
Interleaved
Noise margin (Down/Up)
12.3 dB / 9.3 dB
Line attenuation (Down/Up)
38.0 dB / 22.0 dB
Output power (Down/Up)
0.0 dBm / 12.9 dBm