Approved Contract.

On the 18 of February I app**** online for a Samsung Galaxy S6 on a smart 100 contract from Telkom. I received a call from the call Centre, went through the whole process including credit check and the contract was approved. She ran through all the t&c's and I accepted the contract. She said the phone would be delivered within 5 days and when they deliver it I must have a copy of my Id and proof of residence. I even asked for a white version of the phone and she said they only had stock of the black. 26 February no phone arrives and I decided to phone 10213 to check where my phone is. They then tell me my contract was declined. I am really confused, the conversation is recorded and legally binding on both parties. How can Telkom go renegade on the contract. I was told to contact 10213, via the online chat service,which I did and they could not be less interested or bothered .