Vacuum Pack and factory machinery

I would like to warn people with machinery that possibly come into contact or are advised to use from Hannes van Zyl from Golo. We specifically told him we wanted a quote to fix our vacuum pack machine. He came to our factory, looked at the machine, took a part out, went to his vehicle, fiddled with the part and put the part back in (supposedly put a nee part in) Took him in total around 45 mins. He then gave our staff member an invoice for just under R10 000 and left after trying to force the staff member to say the invoice would be paid. We phoned his office within an hour, told them that we had insisted on a quote first and he had recieved this message in writing. The message said that we couldn't fix this machine without a quote. We told the office that he must come and take the part out and bring us the old part back. He then contacted us via whatsapp and said we needed to pay and no he wouldn't come back to take the part out..we since found out that the part is the old part that he just removed the labels from. He has on numerous occasions threatened us with legal action to try get payment. We have refused again and again and asked him to fetch the part and return the old part. We have insisted that he makes arrangements with us before entering the property. He just says no. We have since spoken to the agent for our vacuum pack machines parts. The minute I told them the name of the company and man, they informed us that he is a known scammer. This review is to make sure people do not use him. He is very nice and comes across as a great guy that will go out of his way to help. But do not be fooled!