SUPER BAD SERVICE!!!!

So I migrated from Cell C to FNB connect prepaid. When however I tried to move from being on prepaid to their Flexi contract everything went downhill fast. <br> <br> First I was sent a new FNB Connect sim card, which I queried to the reason as to why this is required since I'm already on their network and received a brand new sim just weeks earlier when porting over. Then the wait began. Eventually after a week and a half I contacted them to find out why my contract has not yet been processed. I was told that they were unable to see my application on their system. This after receiving confirmation emails, a new sim card, and being billed for the delivery of said card. Fast forward a couple of days and calls, I notice that now there's a new number with the contract on my profile. After phoning them a gain, a couple of times, I was informed that they are unable to migrate my prepaid number to contract and therefore assigned me a new number (All of this without notifying or consulting me). <br> <br> So how is is possible that you can port my number from another service provider, but you are unable to internally migrate me from prepaid to post paid?