Charged double for databundle bought online

On 20Nov. 2015 I bought a 1GB databundle online, using 1600 eBucks on the FNB app. I never received the databundle and decided to wait until the following day, as that was a Sunday night. I called MTN the Monday morning and was told that it could take up to 24hours. However, after waiting more than 36hours, still nothing. In the following days I made several calls to MTN and every time I had to hear that they didn't receive the eBucks and that a call will be logged and the query supposedly escalated. One of the consultants I spoke to in the following week told me that he can see that I bought the databundle and will \release\" it for me. I was so grateful and remember asking him why no one else could see this and just release it for me? So finally I received the1GB I bought over a week ago. However when I received my invoice for December, it now had an extra amount charged for 1GB ad-hoc databundle. I've been trying since January to sort this out and explain what happened to numerous consultants, but I've had my account suspended twice so far. FNB did an investigation from their side and informed me that it was resolved and MTN would reverse the amount. MTN still demands the money!"