Bad service

Got a contract with MTN (Mondo), they sent me a email to say my phone is with DSV when I called they said my package is with them but they have not released it yet with no explanation as to why I also mentioned that my number has changed and they said they will change it ASAP, I called again the next day and the agent said they still have not released it yet as they can't get hold of me I asked if they have changed my number and they did not, I called the following day again with the same excuse I called again that afternoon with the same excuse I sent a complaint with no feed back it's now the next day and still nothing, I can't call at the moment as I don't have airtime as it was wasted on all the calls made to DSV, I am worried I start paying my contract but with no phone in my hands to pay,