Edgars Account Credit Limit Increase

On numerous occasions in the past Edgars have offered to increase my Credit Limit on my Account, but I have on most of those occasions politely declined. I called Edgars today (08/04/2019) to request a Credit Limit Increase on my Account, but they have now informed me that I do not qualify for an Increase. Edgars have not provided me with a reason for this. I would like to note that I have never missed a payment on my account and thus there are no outstanding amount as I paid on the 5th of this Month (April). Can someone please get back to me to explain why I do not qualify for an Increase?