Insulted by a incredible connections staff member at the shop and he also disrespected the manager infrastructure of me

I have never been this disrespected at a shop your staff member Sphumelele from Incredible connection Ferndale on Republic Randburg has no respect at all calling me a small boy to leave the shop after he forced me to buy a product that won't fit on my printer. And the not even sorry when his manager ask him to Apologize I will never buy at any incredible connections ever if this matter is not sorted and I will go and check at the shop next week with the manager if anything was done with the insults and disrespect that have received at incredible connections Ferndale on Republic. Angry as I never experienced this before as when doing Mt purchase at Ferndale.