When I originally got my car they quoted me a pric...

When I originally got my car they quoted me a price, I filled out all the paper work. Got the car a couple days later. Everything was fine, then 3 weeks later, they call and say the monthly price was going up because someone in finance messed up and the price was actually $240 more per month. So the lease payment went from $240 to almost $500. I had a signed contract and they wanted to raise the price after I was driving the vehicle for three weeks. They said the reason was something changed on my credit score. I don't understand why the price would change after 3 weeks of having the vehicle. I don't get how that was my problem. The sales rep Don harassed me for almost a month asking me to sign a new contract to agree to the higher price. I refused to sign, so he then told me a sob story on how he was suspended from work because they lost so much money on my deal. Fast foward 3 years later, same dealership continuously calls and emails me after I told them I no longer have a Cadillac. They don't bother updating their records, they just continually call and email me. This was hands down one of the most unprofessional companies I have ever dealt with in my life.