Negligence mishap n miss leading managers

Went to the BP garage Bara because my car was complaining about low level of oil. The petrol attended helped me, and l went off to complete my journey, the following day as l was running my personal errands the car complained again of the level of oil, n l was shocked and surprised, I stopped at the nearest garage opened for the attendent n he immediately said mam pls pls come see this before l touch your, car l went out frantically so to go see, the shock l got the oil cap was opened and the oil had splashed out and was all over the engen. They advised me to go back to BP Bara to tell them what had transpired, which l immediately did as l left total garage. I got to meet with Gift and Refilwe Matlhako who are "the owners" of the mentioned garage, who said to me l should take my car to BMW to have it checked out if there are no damages to the car,and that their business insurance will be paying for everything l made a booking and when l tried to engage them future they are now not picking up my calls, they sent me a msg saying that this matter is now reported to their lawyers and they will engage with me from now on, my question is why did Gift tell me to make a booking with BMW whereby they know that they will not pay for any damages, Refilwe is very rude and undermining, whenever she hears it's me on the fone she just puts the fone down on my ear n never picks up after that, how best can l deal with this situation? Please help