Chase - Visa Review

I had a wamu card which was great. Loved having wamu. When chase took over things went downhill.  My apr went from 9 precent to 24 percent. That was a major increase. I only used the card for the things myself and my kids needed. i had charged a little over half of the limit. I was making regular payments over the minimum payments that were required. Then the other day i checked my mail and there was a letter from chase. They cancelled my card without any notice. they canceled because I used over half my limit. I couldn't believe it why get a card if you cant use it when you need to.  They also did something kind of similiar to my sister.  She had a chase credit card she used it when she needed to she used over half her limit and they dropped her limit dramiticaly. So I dont like this card or this company. What if i had an emergency and had to use my card to get somewhere. they should at least give notice if they are going to cancel someone's card.