I had my timing belt replaced and ever since doing that it making a noise.

Lining up the belt is critical in that engine if the belt broke or slips that is an interference fit engine and will bend valves. Remove the fan belts from the front of the engine and run the engine see if the noise is still there if it is then you have eliminated the noise from being anything driven by the engine. They may have to remove the timing cover or crank pulley to see what is going on. If it making a noise within the timing cover then there will be a mark on something that is rubbing. I am sure the shop that is doing the job has a workshop manual but Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out www.hmaservice.com lots of great information.

More than likely it's only belt noise...check belt alignment.