I have 2 capital one credit cards with $300 limits. I have recently recieved multiple mailings saying I have been approved for a "Prefered Platinum Plus" card, in addition to my 2 other cards. I have called and asked if they could increase the limits on my current "Platinum" cards, but was denied. Should I apply for this new card and cancel my other 2 if I am approved? I hardly use my current Capital one cards because of the low limits.