Stop *****ing my money

At end of Nov 2017 I took out a contract for 2 handsets and data. I cancelled it within the 7 days as I only received one handset and the deal was for 2. My reference number is MV ********** . I returned the phone and both sim cards. You have been billing me R185.60 every month. I do not have a contract and I would like my money refunded.