FNB could do things a bit better

Recieved a call from FNB and was told I need to submit tax forms regarding tax/income I am paying/receiving outside of SA. Had no idea what this was about because I have only been on holiday outside the borders of SA, nothing else in my life, so have no idea where this is coming from. This was the first correspondence I've received regarding this. Asked the call centre agent to email me what I need to provide FNB. Instead I receive an sms stating I am reminded to submit tax forms or my account will be frozen, no other information. What documents?!? I still haven't received anything or been told what to submit, and how and to which department, just a suspicious phone call (where she greeted me by my middle name) and the sms she sends me afterwards. Am I now supposed to phone FNB back to find out what's going on at my own (cell phone) expense??