facebook & youtube marketing

we are looking for a highly skilled Facebook marketing team, who can give good ROAS after the ios updates. we have an e-commerce store, so we need GUARANTEED ROAS. you must have a good in-house graphic designing team and research team. we can work on fixed monthly fees or on small sales percentages. freshers, please don't apply. payment will not be made after one month's performance. as we have already lost too much money trying different agencies, who just promise world nd deliver nothing.