How to get my hard wired motion activated outdoor light to turn off?

Bought the house several months ago and over the driveway is a motion activated light. I've checked all the switches in the house and none of them control that light. None of the ones in the basement and not the one in the garage either. It stays on 24/7 and I don't like that. It used to work perfectly until a couple weeks ago when it would be stubborn about turning on. Now it's on and won't turn off as of the last few days.

So I googled some quick fixes and tried my breaker box. Even shut off my whole house but it was still on with all of the breakers turned off. I'm on a budget, so I'd like some wallet friendly ways to fix this if possible. Otherwise I'll have to deal and wait till I can get an electrician.