BIS

I purchased an unlimited BIS package on wed 18/11/2015 which lasted all day. At 5pm the service had stopped working as if the BIS package had expired. I have called the call centre on numerous occasions and almost all of the staff are unaware of the problem and want to transfer me to their technical call centre. As soon as i am transferred i get a response of it being an incorrect number and have to call in and explain the problem to anothet consultant all over again!!!! I have sent Mtn a twitter message and recieved no response. It has now been more than 36hrs and i still do not have BIS(i was first told that it would be 2-24 hrs until resolution) .