May i please have my proof of cancellation and refund so i can be able to move to another provider , NO SERVICE SINCE DAY 1

I took out fibre order with them and paid full R395 on the 06.05.2021 , had bad service from the installer Clement on the 10.06.2021 he ended up not installing then went back to their office and cancelled my order , ive been contacting Supersonic from then till now with no help , everytime i call they cant see anything on their system they'll escalate , I've been the one making effort to get hold of them no feedback or progress report from them . i now want my refund and its been 3 weeks waiting for it no one knows what's happening , billing dept. works only Tuesdays and Fridays but still I'm not being assisted . I also need proof of cancellation but unfortunately i cant get to be helped , I'm on the line now for over an hour 30 min waiting for assistance nothing still .