Shocking MTN Service

I am to my wits end with MTN, typing F bombs would best describe my frustration however will respect this forum. In September of 2018 I cancelled my cellphone contract and migrated to Prepaid. SimCard has functioned fine until 19/02/2019. In calling MTN to find out why my number has been suspended, Contracts department tells me it is Prepaid whilst Prepaid says it is COntract, others simply cannot find it at all. It is 24hrs later, I am still offline and NO ONE at MTN can assist, I have been transferred between more than 10 people and each tell me they simply cannot assist, WHAT THE **** MUST I DO NOW????