Edgars - Limit Increase

I have an Edgars account for years which has been well maintained. To my knowledge, I have had one limit increase since opening of the account. I keep on getting notifications (both on the Statement as well as when purchasing in store) that I am due for credit limit increase - however when sending in the required documents I am told the limit increase is declined. A few days later a consultant calls and says I'm due for a limit increase would I like to go ahead. Absolutely terrible service and the consultants are unhelpful and can't give a reason. Find it strange as its only Edgars that won't provide a credit limit increase - however I have no problem with my other clothing account. Quite frustrating too that the limit increase can only be done telephonically once bank statements / payslips have been sent. Completely unhappy and unacceptable!