Frustrated customer

Please advise and help. I approached MTN for a business landline number early May,as neotel has liquidated. Every single document they asked for I have submitted. I d been calling almost everday for follow ups,they'll keep promising in vain to come install the line but today is the 1st of July and my landline has been since closed by neotel and this is going to affect my business big time. This is my business number and clients can only get hold of us through this number. I have been waiting for almost 2 full months and sometimes they won't even answer my calls or will promise to call me back but they dont. Please help!