Bad behavior after sales

I bought a Polo from Barons Bruma in 2016. Three years later I discover a difference in my deposit paid to the bank. I called the dealer, spoke to Lorriane, was told to park the problem, called Carmen Business manger, was told the amount is small. Left a message for Jashen Dealer Principal, no response. Went into the dealer spoke to a person by the name of Imrara02 who confirm there is a problem. Would call on the Monday. I called on the Tuesday and find a very different same Irama02 who told me the problem was resolved. I can do what I want. REALL VW. Is this how you tried people after the sale happen! Were is the family VW! Provide the proof the problem was resolved.