Contract Ended but transferred to lawyers

<p>I joined Body lab gym for my girlfriend on the 7th of November 2014 at the Field Street branch we signed a 2 year contract which ended in November 2016 as per agreement ,even though my girlfriend wasn't using facilities because of the state of the gym i kept paying the monthly installments, it comes as a shock to me now when im contacted by their lawyers that ive defaulted on payment after the contract has ended,the payment I made was on November 29 2016 which was the month the contract was due to end,its really irritating because in December 2015 they did the same thing and put me through to their lawyers about payment which hellopeter.com help me slove when i provided proof that i was paying Body lab even gave me reference D273870 to use when i made payments,Im confused on how am I owing this gym after the contract has ended,please help me out I can't be blacklisted for Nothing. </p>