Best Buy Geek Squad Best Buy 7 trips to the house replacing the same part repeatedly. Spring Hill, Florida

I purchased a Sony Bravia TV in 2018 brand new. It never worked on the eithernet cable, everything else was fine including the WIFI.  I had a 5 year extended warranty with Best Buy Geek Squad when I purchased the TV FOR 1300.00 dollars.  After approximately 7 trips to the home from there "Tech" the Geek Squad and replacing the same mother board with the same results 6 to seven tims for a least 2-3 hour visits each time they the GS took what was a workable TV destroyed it to the point it was unwatchable. 

I finally after a year had them replace it per there agreement which was a huge struggle since the contract  stated after "Two repairs" on the same part under there lemon policy the TV would be replaced.

Well they replaced it just recently however they now inform me that the remaining 3 years of the contract I paid 300 dollars for is now forfitted since they replaced the TV per the warranty agreement.

To me this is unethical upprefessional since they dragged me through the mud to begin with now they say no coverage on the new TV. This to me is a rip off I should be entitled to 3 more years at minimun on the new TV.