FNB not contactable and impossible to transact with when out of SA

It is impossible to contact FNB, particularly if you are out of the country as I would imagine a number of their clients are.

I have a Share Builder account that I have been trying to close for a number of years now and had no luck which has resulted in monthly charges - total cost of over R800 now for a service I do not use and have been trying to close.

Help!

Please note that the mobile number is a UK number which, again, is impossible to include in my online banking profile so, FNB do not have my contact number because they have made it impossible to include.