No delivery of phone after 3 weeks

I signed a new contract with MTN on 27/10/2015, this was approved on the 29th. It has been 3 weeks since the approval and i have not yet received my handset or sim card, I followed up with the store and only then did i receive a response that there is a problem with stock and it may only arrive at the end of November, Why was the phone even advertised if there was an issue with stock?? Is it acceptable practice for a client to wait for 5 weeks for delivery of a phone??, I have been stuck using a prepaid phone for the last 3 weeks incurring costs for data and airtime usage, the point of me having a contract is to avoid these unnecessary costs, I moved over from another provider in the hopes that i would have received better service from MTN but i have not even received my handset or sim card as yet and i am already regretting joining.<br> <br>