The easiest way is to go to their physical store in shopping...

The easiest way is to go to their physical store in shopping centre and make a scene.
And refuse to accept that they have nothing to do with problems you want solved..

Second best is to actually speak with someone and threaten to call the ombudsmen.

Online: you can sign up without problems. But with problem solving you often end up in endless loop.

From Botswana, good luck!
Give ombudsmen a call.