The worst service ever

I bought a week time share with this company. As a gift for attending the presentation they gave me a voucher for a week holiday. When I tried to redeem the voucher it was informed that the voucher was invalid. I then proceeded to cancel the purchace. They sent me some forms to fill in to refund the deposit. This I did and faxed it to them. They refunded some of the money but keep on sending me emails saying that the info was wrong and that I must correct it. There are 3 amounts in question. The one amount that they query is R1000. They keep on saying it is a credit card account when in fact it was a savings account. I can not get through via the customer care line who promptly cuts off the call. I am now fed up with this battle and if I do not get it settled with in the next 10 days I will be forced to go to court.