Dissapointing,Rude , and bad customer services full of empty promises

I have been with Netstar for 7 years .I had an accident in 2017 my car was written off.I called Netstar to cancel the old tracking device account or replace it and install on the new car i bought .The person who was assisting me mentioned that I will have to pay the installation fee which was once off and the monthly premium for the first month .I agreed on that . I was busy ,but I noticed there was something wrong with the billing .The premium was actually higher than what I used to pay .I ignored it for several months ,until it clicked in my head that the premium twice what I used to pay.I called Netstar customer care , I was referred to the retention department .I was told that the old car account was not cancelled on their system.I explained to them that I asked for the old account to be cancelled and my new car use the same old tracking device for the old car. I was promised that they will investigate and issue a refund .I did not get any feedback regarding the refund. I called them again for the second time I was told that they will not process any refund as they are not sure if i asked for cancellation .I explained why would i not ask for cancellation if my car was written off.The lady assisting me was rude not helpful at all .She promised to investigate the matter and look for a voice recording .I was promised a voice recording .After 3 weeks of no feedback I called Netstar again and i was told they could not find the voice recording . This company will promise to investigate and correct their mistake and do the opposite .They will promise to give you a feedback but wait for you to call and do a follow up .They will blame you for the their *********** workers .Not accountable for the wrong doings ,such a dissapointing custumer service!