Unwanted refund

I bought a couch online and the order was processed, after a day i received am email that my refund has been processed because the couch is not available, i was not notified about the refund and am not interested in a refund, and when i phoned customer service to try log a ticket and ask that they cancel the refund and i will choose another couch because i do not want to wait 14 days instead of taking another couch, the agent was not helpful, i asked for a manager and she said there is nothing they can do. this is very poor service and totally unacceptable. i need this to be resolved ASAP.