Cell C financial woes

It is no wonder this company finds themselves in a financial mess and not even a complaint directly to customer service resolved a simple request. In short the story starts with deception. Two contracts are nearing the end and a salesman calls from the upgrade Dept claiming the contract ends earlier than documented ( end Sept 2020) and unless you upgrade immediately you will be liable for higher costs. Response: please submit all info by email for perusal so that we can make an informed and comparative decision. (This started in June 2020) Since then a few more calls from upgrade Dept and the same customer request, still no email. Also a few more calls from retention Dept and the same thing occurs but the last person stated: we are not permitted to send emails! My question is why not. Do these corporates think they can survive purely on deception? Over the past ten years I have seen many too big to fail companies wiped out and often through arrogance of thinking they are king, instead of being aware of the power of the customer. There are other things they do, similar to their opposition which is deception by design and it is time consumers called them all out.