No correspondence no help no customer service

I have been trying to increase my credit limit for almost 4 months now no correspondence I filled in the increase form at the branch & no phone call sms email not even a response whether approved or declined, why should it be so difficult to give good customer service yet if you miss a payment the head office will call you constantly. Being a loyal client means nothing when the service is pathetic. I have emailed the customer service department in July for an answer till today I have not even received a reply. How hard can it be for them to decide if I deserve credit after being a deligent payer? I have previously been unemployed and still made sure this account has been paid. Really feel terrible being loyal and treated as if you not appreciated. If you cannot help me then atleast have the decency to let me know