Bad Customer Service from FNB

I have been trying since Tuesday 14 May 2019 to find out from FNB whether they still do Bank Guarantees. I have driven to Ilanga Mall Branch, only to be advised that Lindiwe, the Manager is not there, she is working at the Pinnacle Branch in Nelspruit. Drove there, she was not there either. They tried calling her on her cell, however the cell was off. How does one do business, if you are sent from pillar to post? I have also raised the question online, however no feedback was received. I have lodged a complaint, also no reply. This is quite urgent, as we are opening up a new business very soon, and requires assistance in this regard. The service currently enjoyed as new clients are really really bad. Not a happy client at all.