Cancellation of Vehicle loan contract

This bank is extremely unfair and refuse to assist clients. They issued summons and repossession of my vehicle (I was only 2 months behind), but I never received any of the documents and when I finally found out about it from the sheriff, I immediately contacted ABSA to resolve the situation. I was told that they had cancelled my contract and flatly refuse to reinstate it, or even accept any reasonable offers of payment from my side. They insist on the full amount outstanding (which is suddenly even more than it should be), otherwise they want my car back. I find this extremely unfair, as I am willing to work with them to resolve the issue and have even offered them a lump sum, which they do not want to accept. If they do repossess my vehicle, then I will still be liable for the shortfall from the sale and all I want to do is resolve the issue and carry on paying to keep my vehicle. I even offered to increase my monthly installment, but nothing I offer, except full settlement, is even being entertained by the bank. When I was in arrears on previous occasions, payments were always brought up to date. I feel that ABSA is being very unreasonable.