what happen to my payment arrangment?

i finished paying off a pervious payment arrangement, than set up a new one for the bill this month. apparently it disappeared and my service was suspended with out warning. no text warning me was received at all either. i call customer service trying to get help but ended up getting gas lighted that i never set up a payment arrangement. never in my life have i received such poor service.  i never should have been suspended in the first place. had i known of course i would of just set up an arrangement again before i got suspended. i work for uber so getting my service suspended while working cost me atleast 100 dollars. this feels highly unprofessional and i do not appreciate how t mobile has treated me.   

Has this happened to anyone before?