Samsung — Fridge complaint

We have been contacting samsung for past 2years and we haven't got any solution. From past 2years we are so stressed and contacting samsung again and again to resolve our Problem but they are delaying the process. They did send the engineers to check the problem but they also don't have any knowledge regarding our fridge and they have replaced our fully working compressor with a new one for which we had to pay the bill. Our fridge is in warranty and engineers are not able to identify what is the problem. After few visits they told us that some coil need to be replaced and they don't have that part. So we said that we will wait but it's been 2years and we are waiting. They told us they will refund our compressor bills and miscellaneous expenses but we haven't received any amount. Now they are just torturing mentally. We are helpless and don't know what to do