Are you using telephone helpline or online forum? If phone line I suggest you try on line forum as they are normally very efficient. They normally reply within a day or two don't keep asking why they haven't replied as this puts you to the back of the queue. They normally sort things quite quickly.
Currently Talktalk essentials with free speed boost LLU
ADSL Link Downstream Upstream
Connection Speed 20468 kbps 1019 kbps
Line Attenuation 20.5 db 9.5 db
Noise Margin 4.3 db 12.6 db