I am in charge of maintenance for a large business application, bought off the shelf from a major software editor, in Europe.

We are now deeply committed to them (as in the cost to change would be enormous), and still need to pay them more money from time to time, for things like additional licences, consulting, ...

The thing is the sales rep handling my sector knows we're stuck, and is not trying at all, making me wait a month for 3-digit quotes, and so on.

I was wondering about asking for a new sales representative, but;

* I don't know if that's a thing. Can you simply ask for a different guy?
* Who do I ask? The current guy?