Very Bad Cellphone repair shop

Made a deal with this guy to fix my Tablet and 2 other phones in return for my Watch Phone.because he wanted it very badly.... But now since the tablet and 2 phones are fixed he does not want my watch-phone anymore and said must pay R1150.00 in order to get the tablet and the 2 phones back...... <br> The slip I have don't even have an vat number or business registration number..<br> <br> He is located in Vredenburg Pick n pay Shopping centre.....<br> <br> What can I do????