Refuse to refund!!!!!!!

I haveen battling with British Airways since last year. I had book a flight to Namibia just before lockdown. So they did put the value on as a E voucher which is only valid for a certain period of time. After numerous unsuccessful calls and emails, I got a response just to tell me that Namibia are not on their route anymore and a notification will be sent out. As my ticket was originally booked for Namibia I expect to be able to use the eVoucher for the same destination. On email British airways said they would submit my request for a full refund - yet for weeks I haven't had a reply regarding my refund. So when I phoned them also more than 30 times before I could get through they told me I am not entitled for a refund. As the ticket was converted to a e voucher. Which will expire as well if not used before cut off date. I feel this is unacceptable. I want my money back because I can use another airline to fly to Namibia. They just don't care and say sorry they cannot refund. Why on email state i will be refunded but on telephone they just refuse? I will never refer anyone to fly with british airways. They are *******!!!!!!