Shocking service from a company that I used to promote

I have been a loyal customer of Discovery for more years than I can count. Lately, I have been receiving the MOST SHOCKING SERVICE from them. I have had an issue with my jaw TM joint for 37 years. They are fully aware of the issues as I had to put forward a request 22 years ago for surgery, which they declined saying it was cosmetic. They have now paid R16,837.34 for me to have an MRI to re-assess the TM Joint, but will not pay R16,384.00 for me to have a simple procedure to fix the problem. I have also submitted a claim, which I clearly wrote "Paid, please refund member" on the invoice, only to be told that they have paid the service provider, noting that "hand written notes are not accepted" on an invoice. If they bothered to check my bank statement, they would have seen that I had paid this amount. I have also just cancelled my Car & Household insurance with them, as they could not match a quote I was provided, saving me R1,416.66 per month. I have always praised Discovery and promoted them to friends and family. They are annoying me so much lately, that I'm not sure the exorbitant prices I pay them every month is worth it.