Cancelling due to (their) lack of interest

I have been a Discovery client for 18 years. On Sept. 10, I was at a supermarket check-out, ready to pay with my Discovery Miles, as I have done so many times in the past. However, the geniuses at Discovery have been changing the app, and the option to pay with miles was just gone. No notification, no apology, no warning, just gone. I stood at the checkout for 10 minutes or more trying to find the option on the app. Gone. I phoned them. "We are experiencing high call volumes." Well, that doesn't help me right now. I paid cash, then, highly irate, sent them an email from my phone. No human response. I followed up on Sept. 12 and 16, using other email addresses. Just more automatic responses about how they'll get back to me. Well, by Sept. 18, since they have clearly demonstrated the degree of contempt they have for their customers, I have instructed that all of my Discovery products be cancelled—Vitality, Miles, and I will switch medical aid on January 1st, per my company's policy. I will not do business with a faceless corporate that treats their customers like they don't exist. I will also do my best to make sure everyone knows this, on as many platforms as possible, and avoids the Discovery brand.