Cancellation of membership

I phoned end of last month to cancel my membership. They told me I can't do it tellephonically and have to visit my nearest branch which is 4hrs drive there snd back from me. I said I can't and asked for an email address to cancel. I have sent 3 different emails already in the lsst week with no reply. I am not sure why a person can become a member telephonically but can't cancel telephonically. My email was sent ladt month and I don't want to pay an extra month.