MTN changed my number without notifying me!!!

Good day. <br> <br> I'm writing this on behalf of my mother. <br> <br> Last week she bought 1Gig of data - which was supposed to last her a month. She bought it via her internet banking, but it never 'came through to her phone'. She then asked me, two days later, to buy her a gig and she will refund me.<br> <br> I bought her a gig from my internet banking and the same thing happened. She never received it. After a good couple of calls, going to MTN in George (where we live) we finally found out that MTN has changed the number she has been using for years - without notifying her at all.<br> <br> This means that all the data we bought went to her old number - that probably belongs to someone else now, and she is without data. <br> <br> MTN never notified her of the change of the cellphone number and I would like to know how they will rectify this and whether or not we will be refunded for the data we bought!!! She has been a MTN client for YEARS and this is not acceptable! <br> <br> After finding out what the story was and what her new number was, she bought 300mb of data, went online and within minutes that was GONE! How is this possible? <br> <br> I will make sure she moves to one of the other cellphone suppliers if this is not sorted.