Bad service

The gentleman at the front desk seemed very nice. I left my vehicle for the service and they even gave me a call during the day to ask for permission to fix a chip in my windscreen Later I received a call to say that I cannot get my vehicle before they receive payment. Note that I have a service plan and I gave them the authorisation letter which is also a guarantee of payment. I spoke to the manager who told me that's their policy. I informed her that this is not my first time I came there for a service with the exact same vehicle and service plan and they Previously gave me my vehicle and were in contact with the insurance provider for payment. Eventually the situation escalated to the dealer principal and this Indian lady (no disrespect to her beliefs) was so arrogant and rude about the situation. I told her that their lack of communication is not my problem as I was not informed of this and if I had known I would not have let them service my car. That's my last time going to motus nissan parrow. On top of that they didn't even clean my car