Can you please tell the company you sold me out to im not owing home choice

Ipaid homechoice account in may last year only to find out my account was sold out already they gave me paidup letter but according to the company they sold my account to im still owing homechoice and im blacklisted. Idid go to homechoice stores many times they told me they cant help me becouse my account was sold out since last year icant to anything coz im blackisted while apaid the money on them not to the company they sold me to