@HMJ When was the last time you paid for your account? If it's been 90+ days then, unfortunately, your account would have been deactivated and number lost.
If it's less than 90 since last payment then submit a ticket via chatbot bubble bottom right of screen to have customer support quickly update your SIM card and allow access to your account.
Edit: BTW if your account is deactivated, then you can use the new SIM to activate a new number/account. However, you will be on the new Public Points rewards system as PM has grandfathered the old rewards system as of Jan. 25th/2022.