did you just joined PM a month ago and ported in number? If you ported in number but not complete the steps, PM will cancel the port after one month and assign you a new phone number, wonder if that is why your number got changed
But check with PM support agent, they can confirm. Message them here
we are just customers and don't have access to your account, you need PM to help. As you cannot login My Account, you cannot use Chatbot to open ticket, so please message support:
