For the past month I didn't get any SMS alert for all my transactions. Initially thought something wrong with telco but today after pumping petrol with supp card still no sms I called the CS.

He reset my phone number and I got a SMS stating that the MSOS phone number has been changed from no A to no B. Weird thing is I have never given any other number except no B. And no A is not even my phone number.

Nope. The numbers are totally unrelated. Don't think it's a typo.

Have been facing this issue since last month. Multiple transactions. Initially thought it was my telco problem but when I faced the same prob yday I knew it can't be the telco problem anymore.

Nah, I'm with celcom. Facing the same issue.