Supersonic Uncapped Fibre not Fair

When this lockdown started i app**** with supersonic fibre for a uncapped line. The application went smooth upnto a point where they were suppose to send the details to the people in my estate who will activate the wi fi. They did not send anything to him and for some time after the application. For that reason i went with another service provider that assisited me the very same day. 2 months after that on the 1 June at night i received a invoice and a message that my account will be debited from supersonic. Now that is not right because there was absolutely no contract signed between me and them stating that i am going to accept their service. Now im trying to phone then to solve this issue and have my debit order pay back to me. The phones just keeps on ringing and you hold on for a long time. If they did activate the service how come they never communicate with me instead of just to send a invoice and demand payment the same night.