Capital One Credit Card Complaint

Capital One Credit card department,

Credit line increase/decrease Missouri

I had a Capital One credit card since 2010, and I never got any credit line increase. At the same time my credit line with other - companies increased from $800.00 to $6000.00. I requested credit line increase few times and they rejected it every time with really stupid explanation. Last time they said it is because I was making too small payments. My monthly minimum payment is $25.00 and I was paying $60.00. I never missed any payment, and my credit score is really good. I feel discriminated because no matter what I do they do not want to increase my credit line. Last year my account was paid off and they still did not do it, so it is not because I have a balance on it right now.