MTN is not customer centric

An online team called me to help with my contract upgrade on the 3rd and we finalized. Today, the 6th, they sent me a text to click a link that will redirect me to WhatsApp so I can confirm my delivery address. I called their customer care line to confirm these details since I don't have WhatsApp. They gave me a number to call (an external company) after I asked to be transferred because they couldn't. I called and got an automated answer saying they have technical issues. I never opted to use WhatsApp as a form of service with MTN, I don't even have a WhatsApp right now, does that mean my phone will not get delivered? It definitely means this getting resolved is not a now thing since I can't get hold of them. I am inconvenienced to the core and it is definitely not legal to expect me to communicate with them by means that I have not agreed to