Same here. Been in the business for almost a year and my account got restricted with no specific reason.
I have been researching for ways and tips since its becoming so frustrating to run my ads smoothly. I found AAS (Arcane Account Solutions) and they do have nice reviews. Been running my ads for a couple of months now and so far so good. Hope this will end all your troubles. Best of luck!
After several months of trying there appears to be nothing that can be done. I have contacted Facebook several times but they give no explanation why my account has been restricted. Only a business with a monopoly-like Facebook would ever block customers from purchasing a service for no reason at all. There does appear to be some form of discrimination going on though I can't work out exactly what it is.