Simple process made difficult!!! After service at BMW is ridiculous

I settled my account on the 10th July 2020. My payments was split into 2, the 1 amount reflected immediately whereas the other payment didn't. On Friday after i spoke to 2 consultant, Oatise was 1 of the agents names which promised to call me once funds reflect. I am still waiting on their call after numerous follow up calls from my side today. When i called in on Monday after no one called me back, they confirmed the amount reflects but it was allocated incorrectly which is a mistake on BMW side .... this is after me sending proof of payment with the split payment instruction.. How ***********! I called in for the 4th time today with no resolution...All i want is the amount to be allocated correctly because i paid the settlement and confirmation that the payment was made...This is so simple but seems like rocket science at BMW side... I requested to speak to Manager but no one came to the phone after 15mins.... Is this the after service you receive from a so called elite brand!!!! I need this sorted yesterday