My account no longer exist, how do you guys suppose I pay my outstanding bill?

Dear T-Mobile customer service representative,

     I have a bill from earlier this year. I was notified through my credit bureau that it was sent to collections. How am I able to pay this afternoon Bill if you guys deleted my account. Your T-Mobile online account system says that my phone number don't even exist or my email so I guess you guys don't really care to get paid.

Good day,

Bryona D. X. Roberts

Current number :4057226598

last4 social: 1400 Bryona Roberts  

urbanliiquorhs@gmail.com  

outstanding bill $400

March 23,1994  

Canceled service (T-Mobile) 4057199834

Account Pin 2733 or 273327

Device: Samsung Galaxy A11 

IMEI: H7KV63JKLCASN85VR98AA9QZ