Supersonic horrible pathetic service

Hi, I sent through an account cancelation email in June to cancel my month to month LTE contract with Supersonic. I eventually had to call Supersonic on November 3rd as they were still debiting my account. I eventually got through to a consultant who assisted me in canceling the contract and advised that I will be credited and she will create a credit note. After multiple emails during the month of December I finally got a response stating the credit note is awaiting approval from the billing department. Another phoned me asking for the router I advised her that I have the router and that I am tores of pathetic service from them. I advised her that once my account was credited with what's owing to me I will gladly give them the router back. They have now debited my account for R2500 for the router, but have still not credited my account for the amount owing to me. You service is utterly pathetic, you guys take your time with my credit by have the audacity to debit my account even though you did not credit me. You guys are extremely difficult to get a hold of and when you do talk to a consultant and ask to speak to a manager the call never cuts. Will advised people to never ever use this company as to me they are a joke.