Bad service and workmanship

I took my motorcycle in to have a silencer fitted. The bike was there for 3 days. When I went to collect it it wasn't ready. The pipe they fitted was not lining up properly. When I queried this a very rude owner told me it is all they can do. They changed me R600 for a piece of pipe 400mm long with two bends that took them 40 minutes to do. A few days later I noticed that the whole system is under so much pressure that it is actually bending. I phoned to inform them that I am bringing my bike back. They told me I can do that but my bike will have to park there until they have time to look at it. These people are happy to take your money but that is where it ends. I will not recommend them.