We received an erroneous invoice of CHF 1000.00. T...

We received an erroneous invoice of CHF 1000.00. To clarify what this invoice is for, I contacted customer service. Already the key when I picked up the phone, I felt cheek, arrogance and lack of motivation. First the lady tells me that the CHF 1000.00 is listed in the contract and I should look at the contract first before calling (although the contract was in front of me and the CHF 1000.00 was nowhere to be seen!). Immediately I ask you to tell me EXACTLY WHERE the CHF 1000.00 can be seen in the contract. In the middle, top left, right? Of course, she doesn't know that because she makes any claims. I ask her to clarify this amount (since she could not help me). As a customer, I have 100% understanding when something needs to be clarified and when
Mistakes happen. However, making claims that are incorrect from front to back CANNOT WORK.
After the clarification, it turned out that I can ignore the bill. Instead of apologizing for the mistake, I was accused and treated like a child. Immediately afterwards she tells me that she will send me the documents by email. I ask her which email address she has registered in the system. Your answer: "Oh, we don't have any"
A huge scandal! I am not responsible for the correctness of your job !!
Towards the end, she tells me to write an email and write down my questions there (just because she is too lazy to solve the problem now). I have read the reviews of Mercedes-Benz Financial Services, an email will be processed in 4 weeks !! NO THANKS !! Of course I told her that this should be done NOW. A huge theater for NIX!
I have never seen such bad service in my life. I do not wish this to anyone! The cars are great, but I wonder what are the conditions of employment? Naughty and lazy? Or rather arrogant and no idea? Really bad! Hope for an improvement, so your image will be presented very badly. Google reviews are really true.
But I'm glad that I was able to experience it! Now I know how bad customer service can be.