Wrong debit order amount since January!!!

I've been trying now since January to get Vodacom to correct my account. There shouldnt be ANY top up packages. Its R200 for the handset and the plan is the lowest available. The amount should be around R253. I am not in the country at present. I expect vodacom to refund the amounts that i was overcharged with since january. This is now the 4th time that i'm trying to correct this. Each time you get back to met and say its sorted. Clearly it hasnt been.