Always say no to bad offer
Within past three months I was called couple of times by my ISP’s (UPC) representatives. They offered me to change my Internet plan from 15Mb/s to 10, of course price would be lowered by 80-100 CZK, but I’ve declined it as I prefer to have faster than cheaper connection. Last call wast a little offensive as guy when I’ve declined his offer became angry and was very close to call me an idiot (at least it’s my feeling).