Bad service at KFC

I am to happy with their service. Especially when it come to the customer experience at a their call center level . I logged a call on the 5th Feb 22(KFC Customer Care Case CAS-849925-L2H7R2) so that I may be refunded from a purchase of a voucher bought on line and did not issue . I was told I have to sent through a bank statement as proof and the details of the purchase , this was done on the same day to my dismay . It is the 15th Feb 22 . I have yet to receive my refund . I have been calling the call center to follow up till today I am yet to receive my refund . Their service is disappointingly terrible. On a number of occasions, I was put on hold for a long period till I had to hang up and call in again , transferred to the next department without being notified.Spoke to one of the managers who told me that there is nothing he can do, promised to call me yesterday and did not. Till thus far I have not received a call from KFC to acknowledge that they received my complaint ? Terrible service they need to look into their process and their customer experience process.