Taking your money and not delivering what is owed....

After buying airtime online, even though the funds went through on my bank account and MTN sending me a confirmation email, i still, after 22 days, have not received the airtime I bought. After numerous calls, numerous reference numbers, they are just giving me excuses and promises. Surely if i sent the proof of payment it should be easy to just load the airtime owed. Is there anyone employed at MTN who can actually solve a problem and let the customer know what is happening???