Account paid but still cutting line

In my life I will never get a cellphone contract with MTN of their service on a data contract is so ****. This is the second time they have cut our Data line as they say we haven't paid for 3 months. Everytime we need to send them proof of payment. They cut our line a week ago AGAIN and now my husband is sitting in Iraq and they are not prepared to assist me to sort this problem out. my only way of communication with my husband is via internet... well I'm paying through my *** to buy data bundles at the moment and the best of all is we are ALSO paying MTN for data we can not use. We eventually got it right for my husband to speak to call centre via my phone and Skype, they said to send an email. We sent an email with proof of payment and guess what, NO REPLY from MTN, it has been a week! Phoned this morning and et again MTN is not prepared to help to find out why this is not getting sorted. THANKS MTN