MTN STEPPA PHONE SENDING OUT SEVERAL SMS MESSAGES

I was sending out an sms on My Mtn steppa cell phone instead it is sending out several empty sms, I phoned call centre and they advised me that they will reset my phone from their side and I must shutdown after 5 minutes but to no avail, no-one at call centre could assist me. I had about R15 airtime and within minutes my airtime was finished. <br> To my surprise Mtn call centre advised me that they do not know how to fix it, I must just go to MTN shop and return the phone. MY WORRY IS, A PROBLEM IS NOT RESOLVED. <br> <br> Message my phone \Messaging large SMSs"Deny or allow\"". If you click Deny still the cell phoned keeps on sending out several empty messages. """