T-mobile charging me after cancellation

I HATE T-MOBILE. I SPENT MY ENTIRE DAY TRYING TO REACH OUT TO AN AGENT ON FB AND THEY WANT MY PIN NUMBER. BUT I DON'T HAVE AN ACCESS TO MY PIN NUMBER SINCE IT HAS BEEN CANCELED. THEY WANT ME TO WALK TO A PHYSICAL STORE AND SHOW MY ID TO VERIFY MY ACCOUNT DURING THIS PANDEMIC. THIS IS GETTING SO RIDICULOUS. I NEVER REMEMBER SETTING UP A PIN NUMBER WITH T-MOBILE WHEN I OPENED AN ACCT IN 2016. AND EVERY TIME THEY ASK FOR MY PIN I DON'T KNOW WHAT. THEY ALWAYS GAVE ME A TEMPORARY NUMBER AND NOW I CAN'T EVEN HAVE THAT. THIS IS HOW T-MOBILE COMMUNICATES WITH THEIR CUSTOMERS AND MAKE THEM FRUSTRATED AND INFURIATED.