JPMorgan Chase Credit Card Complaint

JPMorgan Chase Credit card department,

Credit line increase/decrease Texas

my credit at Chase, -, and - - all had decreases in credit limit for what they say was for a change in credit score, I bought a house and I have a long history with Chase and have always paid my balance, and I have n't even been late on any payments for the last - months, never late with a payment on either of the cards. Im a new customer at - and - but I have never been late and paid the balance at the time of he decrease. I had not even used my - card for months, then about - weeks ago I go shopping and spend about half the balance, still not missing any payments, and paying a - payment at the same time, but today I get a letter saying they have reduced my credit for - reasons listed on letter and no specific reason was given, stop the credit card companies from reducing our credit for what they feel is a change in your credit picture although you pay on time