Supersonic - Paying but no activation

So I've been with supersonic for roughly 2 years now, even through COVID and the lockdown I've been paying my account faithfully. After meeting my fiance and moving in together I've not been using my WiFi as he has uncapped... But let me just make this clear been paying my account even if I wasn't using it. We moved to a new residence and waiting for or WiFi to be moved, I phoned supersonic after they told me I'm on arrears over 1200 I paid 1800 so if anything else financially has been left out I am covered... How they come up with the idea that I'm behind is still beyond me but never the less I paid.. they told me a new invoice must be generated and it will be mailed to me.... I'm still waiting after 3 weeks ( please take note I sent my prove of payments and paid in total 1800 )... They were going to stay in touch to let me know what's going on. Nothing .... 3 weeks. I phoned and on greeting I wanted to talk to the manager. There is no manager... The woman has no idea how to handle the situation as you can imagine I'm pretty frustrated by now. So I requested my money back and canceling of the service..the phone was put down in my ear. So how does this service work, they can't allocate my payment they can't find my payment. Even with the Prove of payment sent to accounts department. Way should we always loose our tempers and carry on like lunatics to benefit from the service we loyally pay for