My singing is so bad you figure to get a gun and shoot it, whatever it is....If my singing won’t get rid of them,I’m out of ideas, too....Mine are gophers.....I suspect they sit underground plotting and laughing at me....We even had a blue heron adopt our front yard ,because they looooove gophers...No such luck and even the blue heron gave up....
Tell them the FBI is hiring.
I don’t know if it will work with moles, but it worked with a skunk under my house.
There are rodent repellent ultrasound videos on Youtube.
I played one of those and cranked it up to 3 times the normal volume. We can’t hear it. I heard a soft clicking sound on one of them.
But rodents will flee it like Hambone’s singing. Might have to put speakers in the yard though.