Sub contractors ruined me!!!

I am an MTN subscriber and have been using my MTN number for more than 10 years. Since November 2015 I have not been able to use my number as Mobiles plus blocked it, i called mobiles plus to inquire the cause and I was told i owed them and needed to pay them the balance of the contract or else I will not be able to use my number ever. I paid them in full before the end of November and I was told that it takes 7 days to have number number transferred to prepaid again. Today is February 10th and my number has not been transferred back to prepaid i have not been able to use my number since November. No one from mobiles plus has contacted me to inform me how far they are with this process. I called mobiles plus in January to find out what is taking so long and the consultant told me that they only received my proof of payment at the end of December even though I called them and emailed my proof of payment immediately after paying and confirmed receipt. I have not been able to use my phone through out the holidays and missed auditions and my family has not been able to contact me. I have lost business because I am unreachable. Mobiles plus has hurt me a lot financially.