I'm Livid

I purchased some good on October 1 of the items was not delivered and i got a wrong shoe size wrong t-shirt and I escalated the problem. My order number was p*** and ticket that was open is 346499. I received R100 voucher for that and my R40 earring was going to be credited to me but that didn't happen. I am trying to use the voucher now and it's not working. I called call Centre spoke to Nazlee who has advised me that I cannot use the voucher if there are goods on special. Everything with you has T&C. R40 was not credited as promised to my bank account and your voucher I cannot use. Why was this not explained to me. My order was *****ed by you for your inconvenience I have to spend a 16-minute call at my cost to rectify the problem and your agent when call cut didn't bother to call back. I am beyond livid I'm fuming.