Ha! Bell abuse - yes, the down side of potty training with a bell
We taught bailey to ring a service bell when she was just a pup - it has served us well! (no pun intended) We are fortunate in that we can just walk outside - but she must be supervised at all times when outside (no fence) - so the abuse was a little frustrating.
I talked to our dog trainer about this and the trainer said that if you are certain that it's not a potty ring - then you can say 'no'. I used the 'no's' sparingly - and let her out most of the time.
Bailey is 3 years old now - and I noticed a significant reduction in bell abuse after the first winter. The older she gets, the pickier she is about the weather - which is just fine for me!
Good luck!!