MFC nedbank

I have a problem with MFC i had 3 months no paying my car installment when the call and told me the want to inspect the car i allowed them to come when they arrive they did inspection on my car when they done with and they said the will take a car a beg them they mustnt take it i will pay it if not they can come and take

All the inspections done they ask me to sign without reading and the asked me to pay those 3 months after i can get my car back i did after a week, when i go to collect my car at MFC storage there are telling me i have paid wrong wrong... So i have asked them which amount i was supposed to pay so the start to do the calculation after i have done with 3 months installment which i agree with the guys

Immediately after the lifted my car they didn't even send the letter how much must but after i oaid what i owe is different story

Which is not fair for me cause all i can they thought i wont able to pay that car anymore and i have paid within a 2 weeks

So please helo to resolve this