MFC Harrassing my Mom

My mom is being harrassed by the MFC staff....just before month end November my mom received a call from a lady called Sindy who claims sh was from MFC head office with regard to her car payments of which they came up with a certain amount that my mom should pay and she gave her a reference number for her account,my mom then payed the car the amount they agreed on last week to my mom's surprise she receives a call from a guy named Mbalula who tells her he is going to repo my mom's car my mom then provides him with a reference number that Sindy gave her and this Mablula guy tells my mom that reference number does not stand anymore of which no one called to notify her he then told my mom to pay R10 000or her car will be repossessed ,he then said he was send by Christine this Christine when she calls my mom she gets so personal with my mom to a pint my mom feels like she should retaliate .my mom came up with R7000 and she got an SMS telling her that she should pay R2500 which did not give her a due date....this Mablula guy is threatens my mom they are harrassing her to a point that it is starting to affect her health....is it right that they should harrase my mom like this even though she is still making payments to the care?can someone help cause it seems like our complains are falling on deaf ears