Very bad service

I have tried everything from phoning costumer care to chating online i have also send mails to there complaints line with no help what so all i cancel an contract about 2 months ago and the lady said there is a 30 notice period so the contract would end nov. 2020 but i have a bill waiting for me december for this line un aware of this i app**** for a new contract and recieved everything but the sim card is not activated yet so im still waiting on this i feel like seeking some law as to regards of breach of contract in favor of the consumers act because this is getting ridiculouse