I had a huge one for 5 years. Regular (and expensive) visits to chiropodist to burn it off/cut it down only gave temporary relief before it grew back again.
Tried banana skin, duct tape, needling, over the counter remedies, filing etc etc all of which made no difference at all. Doctor didn't take the pain seriously, so I insisted on a referral to podiatric surgeon. He said he could cut it out deeply but would mean 6 weeks on crutches no weight bearing. Plus, he said if the verruca can back along the scar, it would be worse than before, so I didn't want to risk it.
Amazingly, I mentioned it in passing to a consultant dermatologist at an unrelated appointment and he said he could laser it of. By this point I was in so much pain and unable to walk any distance, so I thought I had nothing to lose. The procedure was pain free, took less than 2 minutes and didn't even require a dressing. That day changed my life and was the best £100 I ever spent! Not cheap but I must have spent four times that visiting the chiropodist to no avail. No hole left, in fact not even a scar where it was.
People were really dismissive of the pain, saying you're immune system will sort it out, which it never did. Probably not helped by the fact I'd just had a baby. But lasers - who knew?!