Mtn yet again!

I have been trying to load a migrate to prepaid date on one of my numbers that are almost out of contract and what a mission! The call centre cannot load term dates anymore like they used to in the past and Retentions only work till 5pm week days and not at all on weekends by the looks of it? I tried Facebook messenger but again MTN cannot help... i have email Retentions a couple of times now and i am still no closer to getting any help...