Unacceptable service from both RCS and Coricraft

I'm an unhappy client as this point. My first time having an account. I bought a couch from Coricraft in Jan. I was charged for a delivery fee that i didn't make use of. i received the package in March and the delivery amount was only refunded in September. Now because the only remaining amount on the account was the refund amount its been accumulating interests. I don't know how many times did i call and i lost count on how many times I've gone into the coricraft store to have this issue sorted and the account closed. Till this day as i'm typing this note my call is not being answered by the RCS which is the financial provider for coricraft clients. I keep getting calls from different people from RCS but the matter is not solved, i constantly have to explain my story to each agent calls each day. im a frustrated client.