Back on March 30th, I wrote about how I'd called Discover to find out if they could lower my rates.  They said they couldn't for my current balance, but they would be more than happy to give me a 3.9% promotional rate on any purchases made until October. A few days later, I received a letter from Discover, thanking me for my continued loyalty, and that they were pleased to confirm my new promotional rate. Then a couple days later,… Read the rest