My hot water is running in the bath tub and we have changed the washers and rings already and it stopped for about 15 days and now is running very heavily

When you replaced the washers did you check the seats for nicks and rough spots? A bad seat can chew up a new washer in a very short time. Shut the water off and open up the faucet and check and replace the seats if necessary. Regards, Tom

What brand of faucet?