Horrible Service and I regret the day I decided to be a MTN client in my life

It's been a month now my contract expired, I call, emailed but seems like I will never be assisted, I need to change my number from contract to prepaid, they even called me on the 16th of February saying it will be charged in three days but up until today 01 March still not charged. They don't even explain why or if there is something I need to do on my side.. Horrible Service from Mtn I regret the day I decided to be their client.