Why Vodacom, Why

On the 24th April i received my new handset and contract. I had asked them to port my current number and in Vodacoms wisdom they ported the number to a pay as you go. While I was in store, where all this happened, they acknowledged the mistake but I had to send the handset back and cancel the contract which was duly done. I had never used the handset or the new contract. They informed me that they would notify me when they received the handset back, which was the 29th April, and I could apply again. Well that never happened, i heard from no one so today, 5th May i called and had to go through the whole process again but this time I was declined. They did not explain why, just declined.