Did not receive what I ordered

2017/08/17 I received the package from Fast Way couriers. When I opened the sealed Mr Price bag I found that the cycling computer was wrong. I ordered a wireless computer and received a wired cycling computer , and on the back of the unopened package the price shows R169.99 and indicate (wired 8function cycling computer) and on the invoice received shown 1 Wireless Speedometer @ R229.99. I did not receive what I ordered ! I want the matter to be resolved because this incident revail ***** !