Horrible service

I took a month-to-month data deal at Telkom towards the end of March. The consultant who was helping me explained everything, and I understood. My first debit order was supposed to go off on 20th April, which is my pay date, but it didn't. I went back to the store to inform them, and they said they put the end-of-month date on the system. I didn't know why, since they had my payslip. Then I was given a reference number to use for payment via Capitec which was on the 23 April, and I did so while I was still at the store. On the 30 they debited my account again. On the 2nd May I tried calling customer service which was nor helpful and I requested a call and the lady called back. I explained everything and send all the documents she requested to confirm the payment. I told her I want the refund and she first explained it will take about 72 hours to process. She then changed to 4 weeks and I felt like she didn't take me serious as she kept giggling during our conversation. I told her to not process it and I disputed the debit order. Now I get a message from Telkom saying I owe them. Please allocate the funds received correctly and leave me alone. Or ill cancel my services because I dont like the inconvenience you are causing me while I PAID. Also I never received any monthly statement