****** my premiums by Netstar, please refund me

I took a policy with Netstar in November 2022 and they promised to install a new tracker and issue new tags. Netstar never delivered as per the agreement (the new tracking device was not installed as well as tags never replaced). However, Netstar collected all the premiums from December to May. I phoned to request my refund based on the fact that they never delivered so they broke the only promise that made our agreement valid. They refused to give me my refund.

I managed to reverse 2 premiums two weeks back but the rest I could not. I therefore request Netstar to refund all my premiums, I do not like being ******.