No refund after cancelation

Intercape cancelled my tickets in 2020 due to covid lockdowns, they gave me vouchers which were going to expire in 2 years, I asked them for a refund and they said they can't refund and I clearly told them that I don't expect to travel in the next 2 years I managed to give someone 1 of the vouchers but the other expired after so many attempts to get a refund but they denied. If you call the contact center or chat with them they will ask you to send an email to *** and they hardly respond to those emails