Happened to me!
Account restricted from modifying ads. But yet the account kept going, spending money, and I couldn't stop them!
Thankfully I had a second admin on the account and was able to get back in.
Now I make multiple accounts to run Ads.
If you search, it's a common problem!
Whats infuriating is that FB want you to use your own FB account to run business accounts, and it's against T&Cs to make fake accounts.
But yet you can be attached to a clients account and get Ad banned for something they do!
Gah! The attitude of FB and Google is infuriating!