CA2004 code since engineer visit

Broadband has been intermittent at best for weeks, possibly a month, TV channels had been working fine.

Then out of the blue an engineer knocked on saying our property was knocking everyone else’s services off, they changed some cables and left. After they’d left the TV didn’t work and hasn’t worked since (two weeks ago).

Service has been shocking for ages and is getting worse, have checked all cables and seem to be right, now also have other providers knocking on door to get us to move to them, ties into a contract though that all the while am paying full price for.

Any ideas?