Frustrated at HIFI and their service providers

I am very frustrated with the service of HIFI and their service provider, i bot a tv online last year may and the tv has given up now, i have reported a fault in the TV 3 weeks back and HIFI assigned me a service provider(PowerCare) who also assigned me (Master audio) and only last week they took my TV and now i am the one who must waste time energy and money to run around these people to give me updates on my TV. They tell me my TV cannot be fixed but now they don’t want to bring my TV Back and the TV is still under warranty, i will never buy from HIFI their service and that of their service provider is exhausting and really frustrated, for the past 3 weeks i am without TV and no updates on my TV