Who can you contact about your fathers mail being sent to your address after you had a address change and have contacted the local postal service four different times and the problem is still not corr?

You can try talking to the Postmaster at your post office and explaining the problem to him. As the supervisor of all the postal workers who work out of that post office, he should be able to see to it that they stop delivering your father's mail to you, and forward it to the new address provided. If, for some reason, he does not take care of the problem, you can then contact the U.S. Postmaster General.