migration to prepaid

My contract has expired. I called 808 and after not getting through for days and was told systems are offline and to call back. I did another day and received a reference nr. The promised sms did not come through confirming my number has been migrated to prepaid. I called back almost a week later only to be told to call back because systems are offline and that no progress was registered against my request. In the meantime the contract remains and I cannot load on much data and airtime because of the risk of losing this during the migration to prepaid. Instead people who claim to be from mtn velocity keep calling and pestering me about upgrades that I do not want! I just want my number migrated to prepaid and my expired contract to not continue on month to month.