"Handyman" not to be trusted

An individual, called Gerhard (cell number ***) who is on the books of Uptasker professes to be a handyman as well as a locksmith. He contacted me on 24 May via Uptasker regarding repairing a washbasin mixer that was leaking. He arrived and worked on the mixer and I paid him R400 cash. The next day it was still leaking and he went to Builders to get a new part for the mixer. He stated the price as being R220. He came to install the part only on 1 June> I was then sent an invoice and the price was suddenly R250 and he charged another R300 "traveling fee" which he then waived after I asked him how he could charge a fee again if the job was not done satisfactorily. I then went to Builders Warehouse just to ascertain that the price for the part was actually R150! The mixer was still leaking after that and I ascertained that the new part was in actual fact too small and he just installed the old part again without an explanation. I contacted him again and he said he will return. After that, I sent hon various Whatsapps which he ignored. I also suspect him of other wrongdoings in my home since I was not here to keep an eye on him. I would strongluy advise people not to make use of his "services" since he is not to be trusted at all. Thanks