MTN CONTACT ME - ridiculous request

I have been with MTN probably for 30 years and paying from the same bank account since early 2000s. Yesterday my hubby upgraded his phone which is on my account. I was in Sandton, but passed the MTN shop at Kollonade Retail Park, Montana to sign for the device and provide my ID. The aircon was off and they had wifi issues. After abour 45 mins I had to leave as I had another meeting. The phone could not be collected yesterday. This morning Ayanda phoned to say the wifi is still off, but she is in Wonderboom or Wonderpark to finalize the agreement. Remember, the upgrade was already approve yesterday. She asked for my bank statement which I found strange, as the contract would continue on the same bank account from which I have been paying MTN forever. She just needs to activate the phone or something, but someone advised her that it cannot belong as MTN changed its rules in that joint bank accounts are no longer accepted??? Why??? The account must be in my name alone? For what???? I have been upgrading and paying for our phones from this account forever. Ayanda cannot help and I have tried the 135 number and no one is either interested or willing to help. I was transferred to a lady's voice that tells me that I mean something to MTN and that I'm valuable, but then I am passed back to the call centre. This is utterly ridiculous and totally frustrating. Can someone from MTN who can actually sort out this mess contact me urgently??? I did not expect this type of service.