I have given up on cap one and CLI. I have 2 cards with them, one being my oldest card of 23 yrs and has my lowest limit of $1200. I requested a CLI early June and was denied due to "minimum pmt too low". Not a big deal, my balance is never much more than $500 and interest is decent so I typically pay $30 on the $25 min due. For all of June, July, and Aug I increased my useage and made numerous pmts from $50-$100 2-3x a week. Every time I use the card, I make a pmt the next day to cover the charge and then some. My statement just cut on 8/23 so I submitted another CLI request. Again, I was denied. But this time they listed several bogus reasons - this time my revolving balances are too high and my credit score too low. Their own credit wise has my score at 718 and my actual FICO is over 750. I also just paid off all but two of my cards and made sure they had reported before requesting CLI. I called customer service and rep was apologetic but unhelpful. I asked for a supervisor and was transferred. She was also apologetic but unable (or unwilling) to help. I explained that I was a long time, loyal customer who has never been late. She confirmed after looking thru my history. I explained this was one of 2 cards I wanted to continue using but was hindered by the low limit which caused me to consistently be near 50% utilization on that card. She again apologized but said there was nothing she could do and that there was no who could manually review my account for approval...it's all computer generated. It's strange that I applied for a citi preferred diamond that same day and was instantly approved for $3200 SL. With the 0% 21 mo bal transfer perk, I will be transferring cap one's $523 balance and moving on. I'll use CO for my monthly Netflix pmt just to keep it open but nothing more. I'm extremely disappointed and discouraged by their lack of accommodation for long term, loyal customers 
My advice, don't waste your time and go with a company who values and grows with their customers.
SingleMom: Probably started out as a so called starter card. If it says Platinum, its lower tier. If so. Starter cards will never be treated as Cap1's prime cards. You wont get much more than that. Rare but it does happen not by much. Usage, years account has been open, yada yada yada. Its stuck. Sorry about your situation. But after 23 years. Its a great history card that helps your AAoA and/or oldest card. Its helping more than what it might seem. Like you said. Run a small monthly bill on it. Keep it.
@Anonymous wrote:
Rather than paying AF on the QS1 for the same 1.5% CB, I would look into combining QS1 into QS and make it a 3k card, keep the age, no AF and same 1.5%.
+1 There ya go Single Mom. Solved.