No refund no replacement....fraud company lenovo

I raised a complaint on 22nd of May 2020 to lenovo customer care .their engineer visited us and after checking laptop, he said that mother board will be replaced. I was assured by the team that the damage part is in transit and my complaint will be resolved within 3 weeks. But after 2 months also my laptop was not repaired . I wrote my complaint on twitter, lenovo team assured me that as parts are not being arranged so they will replace my system for which one of their executives visited my place on (19/08/2020). After that they provided me a DOA certificate which was valid for 10 days and we were told that within this period we have to visit the dealer from where we purchased the laptop with all relevant documents. We visited there on 21st aug. There they said that as that same model is not available so we will have to choose some other and will also have to pay the differ amount. We agreed on that. We selected one. At the time of biling they asked us to pay the gst amount of previous laptop which was not working. Sir if they are providing us replacement than why should we pay the gst amount that was about 10000. We denied and return back again we raised issue. Lenovo people kept saying that they r working on our complaint and they will come with some good resolution . At the last day they said that if we want replacement than will have to pay the gst amount. Or else they will give replacement and we will have to wait till the defective part come. Sir it was lenovo who was not able to give proper service and they only offered replacement also and again they denied. We have the extended warranty but neither my laptop was replaired nor replacement was given. After that we sent so many mail but no response from their side. Soon going to file consumer case.