Rain cancellation and refund request

I took out a rain sim card in March of 2020, my work then provided routers and sim card to assist with working from home. I then request cancellation on the rain website on the 25/03/21 however I have still debited from my account on the 01/04/21. I called the call center and spoke to Kelebogile with call *** and was no help at all and refused to give me her surname and said that they are not allowed to give out their surnames. I am appalled by their services and want my money refunded as now my account s in a debit balance, I need this fixed ASAP!