BAD SERVICE

I have experienced bad service and still experiencing bad service with Cellc,i had a contract with cellc which i cancelled on july .Cellc did not bill the amount that was due on July 2019 on the day that they were supposed to debit.I then got a sms informing that my account is in arrears on the 11 August 2019 i contacted Cellc to make arrangements for payment i was provided with the Easypay account on the 22nd August 2019.I went to pay the amount of R418 on the 23rd August 2019 and i called Cellc to confirm if they did get my payment the lady that i spoke to advised that the payment will on reflect after 7 days and i understood.i got a message on the 27th August advising me to send the proff of payment and i sent the proof of payment on the same day 27th Agust 2019 and after that i have been sendign proof of payments and getting feeback from Cellc acknowledging my payment and i also logged a query for a refund and still now i am unable to get this issue resolved.Please help me resolve this issue urgenlty i just need my refund that is all