No service from mtn

My phone is still not activated, i asked for my contract to not have a limit on there, but i keep getting this <br> Message: \Air time is exhausted and you call has been terminated - please load air time".<br> <br> This is totally unacceptable - I am paying for a service which you could not restore since November 2014.<br> Latest account received 07 /01/2015 - attached.<br> <br> Please cancel this contract with immediate effect to enable me to obtain a contract and working phone service from another provider.<br> <br> I was assisted by Belinda (manager) at Kolonnade and Mpho who have been trying to sort this mess out but to now avail.<br> <br> I will return the instruments (phones) - no charge to myself!<br> <br> IF this is not sorted ASAP<br> <br> G VAN NIEKERK"""