2 different companies calling me

MFC gave my details to 2 different companies both calling me to surrender my vehicle when I tell them I have an arrangement with MFC and will be paying next week wednesday they tell me i must hand in my vehicle. I am only 60 days in arrears. I have been paying every month. Please assist as I dont feel safe with these people saying they tracking me meanwhile i am telling them i will not give my car to them as I have an arrangement.