Nightmare with contract upgrade

I recently upgraded my contract(s) with MTN and had to do a sim swap as the new device had to get a micro sim. Was told it usually takes 24 hours so all good, waited it out. After 2 days of waiting I knew somethings was wrong so I called customer care, according to them the sim swap went through but my sim just wasn't activated so got told it wil take 24-48 hours for activation. After 48 h still nothing so I called again, I got the same story activation, just to get rid of me I got given a number for \technical support"1555"