bridge of contract

I joined the Kempton Park gym around August 2013, I signed a 36 month contract, meaning by August 2016, the contract would've finished but when I called today to confirm the total amount owing I received a statement of R4418.88 but according to my knowledge it should be R1200. I cancelled my debit order in 2014 ( and did not pay for 3 months) but had and did pay for the 3 months R1000.But the monies which I paid before cancelling my debit order does not reflect on the statement I’m also being charged interest and sms sending fee from Bennets & Associates. Plus they giving discount of 15 % . This is a money making ****. DO NOT JOIN Body Lab 