Hisense 55" smart not fixed

I am very angry to Hisense technicians, it took them two weeks before they send a technician to come and fix my TV. The technician phoned and told us that the TV was strike by lightning, and he requested money (R2500) to replace those boards and it is still under warranty. He told us he can fix it provided we pay him R2500. How do you know if the TV was strike by lightning? The TV went off during the day and the was no sign of rain. My warranty ends April this year. I want my TV to be fix