Termination **** on financed cars

I informed MiWay that I will be changing my car insurance to another service provider. MiWay called to confirm cancellation-the call was only of me verifying my personal details and verbally stating I'm canceling MiWay and confirmation that I'm covered till the end of November. I was shocked to find ABSA debited an extra R500 and on enquiring ABSA states that MiWay informed them that my car insurance is cancelled hence the overcharge. It's frustrating that MiWay did not provide necessary documents neither to myself nor the bank showing proof of cover till end of the month. Now I have to make calls back and forth ONLY to try and get MY money back! 2 phones calls to MiWay and STILL no email showing proof of cover. Is MiWay scheming with ABSA??