Come now Edgars. This is not what I am used to!!!!

Having to deal with Edgars is very frustrating. I have been trying to get the accounts department to sort out their paperwork for a credit I returned almost 6 weeks ago.They are at fault and phoned countless times to their accounts department at head office.They listen to my dilemma note it on the system, promise to sort it out and return to me but never do and go round and round chasing my tail. A very simple adjustment on their side has now landed me a black mark on my credit score and am totally frustrated to the extent that I am now considering closing my account. They used to be very efficient but how times have changed. Any help from a manager would be very appreciated. Angry and frustrated client.