No Response after online contract application

I app**** for an Iphone 5S contract on the 16th of March and to date have not heard back from Telkom at all, did not even get a reference number or email after I completed all the online forms including my bank account details for a debit order!! Have tried to phone on numerous occasions can NEVER get through to the sales department. I just want to cancel this contract as I can not wait more than two weeks for any type of response from a company this is bad service to the extreme.