Keep doing the pelvic floor exercises. They will take time to strenghen. It would also be a good idea to see a physio, they can check you are doing them right and recommended some other exercises. In a very small number of cases there is a bigger problem which surgery mostly helps with, but most of the time it's just a matter of time and exercises. There are physios that specialise in these things (that's how common it is!). Good luck, I know it's an annoying problem.