Mediocre service and incompetence from the finance department!

I submitted a return and requested for a refund to my bank card. I followed all the requirements and waited the stipulated time (3-5 working days) for the refund to be processed and reflect in my bank. I called in as 5 working days had passed with no refund. I was given a proof of refund via email, however there is a “Bank interface timeout “ error written on top. The transact had no batch number and no authentication, meaning that the refund had not been fully processed. I sent an email back to support on the 29th October asking them to escalate the matter to the finance department for correction, there’s no update from the finance department to date. I called in on the 31st October around 10 am again to follow up, I was told the managers were in a meeting and I would get called back, I am still awaiting the call back. How long does it take to investigate a transaction and affect payment? I do this on a daily basis at work and it has never taken so long to correct any customer query. I wonder what type of internal controls are in place, do you want to tell me that such a big company has no checks and balances in place? I use your platform on a monthly basis, I do not expect such mediocre service from your team. Please correct and effect immediate payment of my refund. This is just ridiculous!