Hyundai Getz 2005 Problems

It could be local interference. I would consult a local locksmith for starters and have them check the lock. Most locksmiths now have the capability of checking and programming keys and could have the local knowledge to tell you if it is interference. You could also check local radio hams, who might be able to help.

The window regulator is probably kaput, take it to your mechanic or an auto electrician and have it repaired.