Double payment

I accidentally paid multichoice Africa with my Nedbank visa card twice for a year. Have been in contact with dstv Zimbabwe (were I live) several time and getting nowhere. Every time I speak with someone, requests that I submit proof of payment and 1st 6 digits and last for of the visa card that I used. I get told that they will come back to me after submitting and nothing happens. I have submitted to 3 different people so far to no avail. Currently no one is answering any calls. I am aware of the lockdown, but life still goes on and customer care should still be available. My name is Gregory Leondis and can be contacted at ***