Blocked from selling and buying on marketplace

I feel Facebook are unfair when it comes to their policies on market place . I sell and buy regularly on Facebook and never cheated and have a 5 star rating and out of the blue they block me from trading. This is so unfair as this is a means of income for certain people and others looking for good deals. This platform should help small businesses and not taking them out of business. It’s only because of us the Facebook community that your business is going well.