Poor explanation of contract

Hi So I have a contract with vodacom for monthly data and a bit of airtime. At the time of purchase It was not explained to me tht they were given me a 2nd Sim card. If they did explain them I didn't understand as I gave away my old phone. I thought my Huawei had 2 Sim cards. Anyway the proof is that for a whole year I was paying R175 a month for money credit. That's R2000 a year. I hadn't used it because I believed the data was coming to my Huawei. I have been in to Cellucity n bin **** to by their staff... Who said they would refund me R1000. Now of course they back down as the assistant said she explained everything. Obviously she didn't. All vodacom can say is they allocated the money every month. And I didn't use it. I am a teacher and was trying to cut costs. Now I have lost R2000!!!!!