Cancelling an FNB cheque account

I closed a FNB platinum cheque account a few months ago online because I was leaving the country. They kept on adding monthly fees, so I followed up with an email just before I left SA, but received no response. I emailed a few days ago and still received no response. Then today I received a rude email, saying that I am not paying my fees and FNB will take further action. The address that was on the letter hasn't been my address for almost 13 years and I know I fica'd my documents quite recently. This isn't even the first time I have had to complain on this platform about FNB. Their service is rediculous. If you try to contact me, please use the email address that you have because I have left the country.