they want me to keep paying

i have paid my finchoice accounts through strauss darly attorneys 6 of them ,and later they didnt debit one for 2 months after i receive a call from lombard attorneys that i am owing 450 which i did settle and got proof of payment ,last year towards december strauss send me notification of me owing i send proof till now i am getting messages threathening to take action for me its from strauss as finchoice says i owe them ,what must i do withthis people maar and i have paid more than what i owe to finchoice honestly