2006 Hyundai Elantra
Warranty and competition

I have Hyundai Elantra 2006. I have got my car serviced from authorized dealers all of them and now i have got problem in car and they say we will not give you warranty because i have not got the service done from them and they will not give the me warranty and asked me to go to the same dealers from where i got my car serviced done for the warranty. This is cause they have competition with other dealers here. Why will the customer suffer cause of there competition?!