Poor service

ook my Suzuki Boulevard C50 800 in in for a problem...starts,idles and cuts out. The 2 guys at Mad Macs said no problem: "coastal tune-up" and new plugs required. Called me a week later to collect. Went there, started the bike... same problem..trip from Pringle to Somerset wasted. Week later they called and said the the STV Actuators were malfunctioning, can't fix and have to order a full new throttle body for R24K. I said no and collected the bike. Brought the bike back home and stripped and cleaned the entire fuel system. STV actuators work just fine! Clearly an entirely different problem! Had to pay R2,700 for a so-called tune up and 2 new plugs AND A BIKE NOT FIXED...WHAT A RIP-OFF DONT GO THERE! I expect there will be no response, as with these kind of places there seldom is:-(