Psl Bulk vs Standard Bank Vehicle Asset Finance

We have a few truck and trailer accounts with Standard Bank Vehicle Asset Finance. This Finance is a lot of money, we talking about Millions. our account no is ***. We have a Nissan UD 2017 Truck that we decided to sell with its Trailer in February 2020. on the 14th of February 2020 the dealership paid Standard Bank R651518,69 to settle this account. The money reflects on the account on the 17th of February 2020. Today is the 12th of March 2020 and still this account is not closed. These people took a instalment again on this truck on the 29th of February 2020 even thoug they can see the account is settled, now we are struggling to get our account close and our refund back. Everytime when we phone them they say they will have a look at it and they give us a new timeline of 5 days. This is just a never ending story. I dont know what to do and month end is comming again then they going o take another instalment. if we ask to speak to rthe Manager then they refuse to transfer us or even give us a number to phone. Please can Hello Pieter help us to sort this problem out?