BMW Drivetrain Issue

Good day

Last year I paid about R5k to BMW Dalpark to repair the drivetrain issue which was due to rats damaging some wires (I had visited an area where there were rats). Yesterday I had the same drivetrain notification coming up while driving and my car started loosing power. I then called the call centre and was advised to go to the next dealership. I went to BMW Dalpark and they booked my car at BMW Boksburg for a diagnosis. The agents called me and said the issue is due to a damaged wire around the engine due to rats. This was fixed last year and I do not have rats where I stay. The quote is abouf R11000 which I must pay from my pocket. My issue is why I am having the same problem which was fixed last year and I haven't been to where I was where there were rats last year? I am really not happy with this and cannot afford to pay this. Hence I have asked for the dealer to stop and not fix it. I am really considering taking the car back to BMW and changing the brand. Please assist.