Supersonic's service is pathetic.

I have a contract with Supersonic Fibre. I have been trying for more than a month to get the 5G password changed. I have tried the whatsapp contact option numerous times without success. I have tried phoning the call centre, and all I got for 14 minutes is a recording: "Your call is important to us, please wait for an agent or press 0 to leave a message". The service from Supersonic is pathetic at best. I would prefer to cancel my contract with them.