Frustrated and confused

I am extremely disappointed with the manner in which I am being treated by MFC. I purchased my vehicle through King of Cars and was informed that my finance application had been approved by MFC. I collected the vehicle on the 8th of October and signed all the release and finance documents. All credit and affordability checks were completed prior collection, and I have a solid credit record. Now instead of enjoying my new car, I have been receiving repeated and harassing calls requesting additional information. First, I was asked to submit a letter from my HR department explaining why there is no tax deduction reflected on my payslip, which I did. Now, I am being asked to provide clarification regarding my leave days and it is not even clear what exactly is being requested and why all this information was not requested from onset. This process is frustrating, confusing and unfair. Why were these matters not verified before my approval and the release of the vehicle? It now feels as though I am being treated as if I have done something wrong, despite following the correct process and providing all required documentation. I would appreciate a clear explanation as to why such post-approval requests are being made, and why issues unrelated to affordability, such as leave days are being raised after the fact. At this stage, I am considering seeking legal advice, as I received official approval and documentation directly from MFC, not from myself. Any further verification should be conducted directly with my employer, not through continuous personal requests to me. I trust this matter will be treated with urgency and resolved appropriately.