Adt cancel

I would like to cancel ADT. I do have a contract with them for 24 months. I signed that contract 19Sept 2016. We move March this year and no one inform me that the contract will extend for another 24 months. I cant afort ADT anymore, I called so much but no one can help me so I can settle my contract. They said I own then R4135 to cancel but no where in my contract said I have to pay all that money just to cancel. Please help me I dont know what to do anymore.... This id whay they send to me Good day Miss C Foord ( ********** 999 - FOO00169) this is the second reminder of outstanding fees . The arrears on your account are R 4135.00 that needs to be paid urgently for your alarm before its on suspension for not paying monthly fees. We do however remind you that you have signed a fixed term contract with Fidelity- ADT commencing 23 March 2018 and in terms of your agreement, the service is provided for the period of 24 months. Please contact Mmotsi Legwete on ********** for arrangements. Thank you Lyalor Security Authorised Dealer of Fidelity - ADT..ĺl Fidelity ADT RST: VALUED CLIENT FOO00169, YOUR SERVICE HAS BEEN UNSUSPENDED. PLEASE CONTACT OUR CREDIT CONTROL DEPARTMENT. KIND REGARDS