Unpleasant Experience

In 2015 I had taken out a three year contract with Blue Security which comes to an end in June 2018. I was informed that this was a rent to own alarm system, in three years would belong to me, any repairs to the system before expiry of the contract would be covered by them as the alarm system was still under contract. Phoned them today 23 11 2017 and requested they resolve a small issue I have and was told that I would need to pay a fee. When questioning them on the validity of the contract, I was informed that the system is not covered, this was all said by a very rude lady who refused to listen and continously spoke above me. I had at one point asked her to be quiet and listen, in the end I said that I would be cancelling my contract once it came up for renewal and was told " well if thats how you feel."