MTN'S PROBLEMS ARE MY PROBLEMS (AND I AM NOT AN MTN CUSTOMER!)

I have been a VODACOM customer for over 20 years, with the same phone number the entire time. On Saturday 5 June I received an SMS from MTN advising that my number had been ported. I have NEVER dealt with MTN. I phoned MTN and was advised that the alleged porting must be ********** as they do not port numbers over the weekend. Today, 30 July I have received notice from MTN that "Y'ello. We've sent your monthly statement and tax invoice for account BA******* to R****S******. MTN Team." MTM have now phoned ME to see that I was satisfied with their service? I explained that I am not their customer but MTN are unable and or refuse to resolve this problem, and say that I must sort this out.