Rain is *****ing my money!

So in the beginning of October i cancelled my rain due to the fact that we have purchased a house and that fibre was the sensible and affordable option to go. I went online and cancelled my rain withing a day i got a call that to confirm and that a courier would come collect my unit. At the end of October my account was debit which was correct and on the 1st of November my line was cut off which make sense. Fast forward to the 26th of November my account debited again by Rain for R699! I phoned requested a refund .I got told that billing department would contact me within 48 hours.Its the 5th of December and i am yet to receive return of my funds nor have i been contacted by Rain.This shocking service from rain.