Not paying back my refund

I have been double charge since December 2022. I am still waiting on my refund even after it has been agreed it was a problem. I have contacted the billing department time and time again to no avail. I will either hear we sent the issue to the finance department to process the refund or i have contacted department to call you back. I am going to the ombudsman if this is not sorted. I have contact you close to 50 times now probably. No one take ownership, no one knows to escalate the issue. It is no ones problem. I feel ****** and waiting for months for a refund. being in the service industry for more than 12 years i am appalled at the service. I would never recommend any one to sign up with *******.