I AM STILL SHOCKED

I WENT TO BUY A DECODER AND I TOLD THE CASHIER I HAVE MY OWN INSTALLER BUT TH ECASHIER STILL MADE ME BUY THE 800 RAND DECODER INSTEAD OF THE 500 RAND DECODER AND I STIL HAVE TO PAY THE INSTALLER 300 SOO COZ OF THE CASHIER AT PEP I PAID 1100 TO INSTALL MY DECODER, WAT A *******