Waiting patiently for my upgrade - being strung along.

I contacted Telkom to upgrade our package as we always running out of data before the end of the month. I was told it would take 7 days. I called in on the 9th of May and they told me the order was cancelled because I paid the account late. If i had not called in I would not have known of the cancellation. I told them the account was paid and that they had to proceed. We ran out of data again and I followed up on 14 May again and was told that the system was offline, they called me back on the 15th and told me that the order has not been processed yet. I call again today and still nothing has been done. I've already bought data and enabled out of bundle billing meaning my costs are escalating whereas if these people did their jobs properly I would not need to do so yet they expect me to pay my account on time.