Bad service and bad attitude

Hi all<br> <br> In March 2015 we took our Bike a Yamaha R6 to the house of bikes service centre in Montana, the owner is Oscar, for a service we were advised that the previous guy who worked on the bike failed to use the right parts causing the head to be damaged. Oscar kept telling us never to make use of the other guy again and kept bad mouthing the opposition. we received out bike back after 1 and a half month and had to pay R6300 after being quoted R6100 for the work done, on the day of collection we were told that it was more. I paid and still asked Oscar if something goes wrong what type of guarantee will apply, he told me that if its work that he had done he will gladly fix it, exactly one week later we had problems with the bike again, i took the bike back to him and they investigated already trying to pass the buck, its now two weeks later i called on Tuesday 19 May and was told by Johan that the bike will be ready on the 20th we called today the 21st f May 2015 and were told by the mechanic that its a further cost of R1250 as they have had to take it for dyno tuning , no one called us to explain to us or to quote us. Oscar was rude and said he needs to make money too.