Problem refunding my deposit

Hi, I signed a contract with Huurkor 5 years ago and I paid the rent monthly. During my stay I had a problem with the burglar door, it stopped working. The charge for that is R890, that I accept. My deposit was supposed to be R6320.30 less R890. But now they've added R1165 to my account which I have no knowledge of. They also sent a faded bill of R2016 from Tshwane municipality (electricity). Please help