After you file

It has been 3 months since I mailed my 2019 federal tax return and still nothing. They cannot provide any information about my refund when I inquire. I received my state return in less then 3 weeks. Yes I mailed it to the correct address. Should I refile , since you can't get in touch with anyone to give you a answer. This is getting very frustrating since we pay so much in taxes and there is no one to help us!