AMAZON Prime video - Milnerton

I found that it was PRime videoI noticed R79 being deducted from my credit card. On further inspection I found that it was Amazon Prime deducting the money. I never joined them or gave them permission to deduct money from my account. I don't even know how long this has gone on. I contacted them but they deny that any money was deducted by them from my account. Even sending them the dates I have and th details they just pulled up their shoulders and said they can do nothing about this. I would be very way of buying anything from AMAZON PRIME as they will use your bank account for theirt own gains.. I WANT A REFUND!