bad service

Upgraded one of our business contracts , signed contract and were awaiting the handset which were delivered to some lady signing for it without any proof of Id or company letterhead . Since September been trying to solve the problem . Mtn's only reply "a supervisor will call you back shortly , our processes are still running " I'm sorry for more than a month now? I am collecting reference numbers like mad , doesn't help anyway . This is a business contract , how can they deliver a phone without the proper documentation . I had to provide a company letterhead and a copy of my Id when my phone were delivered . Mtn have already sent me an invoice for the upgraded contract . The message is quite clear "pay up cash***s " Still no headset and therefore according to me NO CONTRACT .