Stephen James Enfield the franchise tell me head o...

Stephen James Enfield the franchise tell me head office dont know what they are talking about.I have reported Stephen James Enfield after discovering about 4 weeks ago in my view that Stephen James Enfield I beleive supplied the wrong oil for my vehicle some time ago and has been and still is in my car for over 6 months.Stephen James Enfield in defence say all their oils are bmw approved however I am disputing inaccurate oil specification.