Not responding since last week Tuesday.

My experience with MTN is disgusting. I called and write an email to MTN, I didn't get any response from them. I was claiming for my phone, the battery is overheating, and I am using for my business. I have been with MTN for more than 20 years, their service is so poor. My reference number is 169adcd1-ff61-458c-a08a-9768bce86f8, I would like to cancel my contract with them with immediate effect. My number is ***.