Bad customer service

I have been trying countless of times to get my refund from Fedex but to no avail. I made an overpayment in July for my parcel. I immediately notified them and was asked to send my documents( bank statements and proof of payments) to Julie Hornsveld-Blair. After numerous emails, she came back to say the refund has been processed and closed so I should expect my money in a few days. That never happened. I complained again and was now assisted by Daleen Smith(Team leader), Cheryl Roach and Sipho Malindi. They again requested for my bank statement which I immediately sent to them. It is November now and no one even responds to my emails anymore. Very bad service received from FedEx. I am still waiting for my refund.