Had R800 airtime before upgrade and R22 after!

Yesterday I've processed an upgrade through the Call Centre. Before the upgrade was processed, I had over R800 in airtime. When I checked after I received the SMS telling me the upgrade was processed, I had like R22 on my contract!!! My R800 airtime is gone! I was not informed of the fact that I will loose all airtime on my phone if the contract is processed! If I was informed I would've stopped the upgrade immediately! I've paid for the R800 of airtime! I expect it back on my number!!!<br> <br> After this I've created a query through the online portal which was just 'CLOSED' without even communicating with me!!! No Call, No email, No SMS! NOTHING!!!! How can a query be closed without resolving the problem or even just calling the customer with some sort of resolution?!?<br> <br> Not the first time I have issues with MTN Service Provider. Also never heard a thing about the resolution of signal issues I have. Last response on that was months back saying 'The tower needs to be upgraded'. No time estimation, No further communication, NOTHING!!!!!!<br> <br> This is the last time MTN. I've had enough! The soonest I can, my contract will be canceled!