Not consider buy new one ka? I think u have to choose ur package 1st. Then they go and do fresh installation.
They dont use the old black thick wire already. Now black wire quite thin, fibre.
The wire i think 1st few meter is free, after that certain meter they start charge, something like that if no mistaken.

Actually after complete installation, u still can use ur old wired line house fon, still same using rj11 cable. But if the package u choose comes with free wireless fon then just use the wireless one, or use splitter can use both.