After I flush the toilet and the tank fills...about 20 minutes later the toilet runs and it does this for most of the day. tightening the screws in the tank on the ball/floater doesn't help. What to do as my landlord is cheap and won't fix a thing!
Seems you have an internal overflow fitted to your cistern, your ballcock needs a new washer fitted, whats happening is your cistern is over filling, the excess water is just running down the toilet through the internal overflow, this is wasting many gallons of water every day, ask your landlord to get a plummer in to fix it a.s.a.p. its a small job. Good luck.
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Try fixfault.com to fix toilets.