Refund & paid up letter

There is no consistency with the interest that Lewis Stores charges,. In November I was told that my balance was R100-something,to my surprise when I went back in December to pay the balance it had increased to R300-something,when I asked for an explanation, no one could tell me anything. Then in January when they deducted from my account, they deducted R500-something, which then puts me on a credit. I am still waiting for my refund to be paid back to me, I have submitted my bank statement and ID copy to the legal department and still waiting for a response. I'm really not happy with how long I have been waiting for my money as well as a payment letter!!