Onida / Mirc Electronics — onida inverter split ac

I purchase onida split a/c on march 2017. Two month before it is not working. I contact onida customer care. Service person attended and he said that ur board gone and to pay nearly 5000 rps. After argument he said he will repair but nothing has happened yet. One month board is with them. I trust onida product that's y i buyed ur new product inverter split a/c, but after this my opinion has changed, within one and half years ur board gone and i have to pay this much amount. I wrote mail to [protected]@onida.com but they are not responding. Do needful.