Convergent Outsourcing review: T-mobile old bill account #330589258

Received a letter from convergent about a past due bill that's a least 10 years old t-mobile cancel my services after I sent my cell phone back to them because the cell phone never work now they want me to pay them 239.38 with a settlement of 119.69 I call convergent and told them I dispute this 10 year old bill and if they do not show a reason or copy of a bill to go to hell they cut me off can you help me with this screwed up bill collector