Horrible service from Hyundai

I spent thousands on having a key a repaired. I asked for specifications that were promised would be done and were not followed. I wrote to a customer service rep thrice only to never be rep**** to. The key is currently not evening functioning properly, the boot button does not work at all!! I have begged for help from the dealership and service centre and nobody has assisted me at all. This is very disappointing service from HYUNDAI....!!