Same thing happened to a friend of mine. 23%. Unbelievable.
Chase did that cr!p to me last year (from 10% to 29% for no reason, had 25% utilization and 730 credit score). I paid it off 2 days later. Both of my Chase cards have not been used, period, since. I have a 1.99% BT deal with BOA that ends in May. I’ll pay it off in full at that point.