Yes there is a way to change the limit info.
You need to log into your master account. Then go to Billing Summary.
Next to your CC info should be a link called 'Change card'. Clicking that will take you to a new screen to change your CC info and at the bottom is the limit info section. You can set it up to $400 US max for a 30-day period.
Thank you for the time...
@Travlr (Main) / @Tymers Realm (Test) 
Okay, this is a stupid problem to have. I went to add another 15.00 worth of paragon points to my account last night and it said I was capped for the month. I really did not realize i had spent 100.00 this month, but evidently I have. (Water Blast, more character slots, etc, it adds up...) I wanted to add some points to get the new +Enhancer slots, and no go.
Why is there a limit, can it be changed. In a related question, is it a sign I should stop spending money on CoH. Help me, 5 year vet, talk me down off this ledge. Should i just go back to reading comics. Alternately, can I get the danged level nixed?