NO RESPONSE FOR CANCELLING CONTRACT

I renewed a contract on 4 June 2021, just to find out after the upgrade that my WIFI doens't work, as my router doesn't support that packaged. I sent them messages on facebook, called them, and e-mailed them. Asked them to assist me with a package with a router which will work and switch the upgrade. That didn't work as I didn't got assistance. Then I asked then to rather cancel this upgrade then, as I am paying for something I can't used. I am now struggling for months for them to cancel this. They ask me for my details, when I give that no response. I am now fed-up with them not doing there job by cancelling this contract.