An official implies or states that payment is required to process your legitimate application.
This is not a logical fallacy — it is a criminal act. Soliciting or accepting a bribe is corruption under South African law. The official is exploiting their position of power over your application to extract an unlawful benefit. There is no legitimate argument here. This is prosecutable conduct.
After you respond, they may push back with these arguments. Members get the full rebuttal for each.