Change of contract

On the 25th of June I went to the MTN shop in Stoneridge to change my contract as I was due for an upgrade. I am currently on the AnyTime 200 and asked them to change this to the Talk 500 but keeping my present device. I signed all the necessary forms. The sales person faxed everything through while I was there. Everything was done and signed and I was told this package would come into place on the 1st of July. I went to the same shop this morning, the 8th of July, to change my debit order date and was told that I am still on the AnyTime 200 package. So why was this never changed?? I did everything I was supposed to - way before the 1st. Seriously?? Maybe it's time for a change then. I need this done IMMEDIATELY!!! This is probably the worst service I've ever received!!