Worst Samsung Service Centre

My Samsung phone has been in for a screen repair since 6 December 2017. It was promised to be completed twice in December which did not happen. I tried to contact them again in January just to find out their phones don't work. I've had to drive there five times already because it does not look like the phones are being repaired (it is still off) and they do not respond to my emails. They asked me for the information they needed to order the new screen in January, which meas they never even ordered a screen in December. I've asked the owner to respond to my email personally, he only responded once and is now also ignoring my emails. Every time I have to drive there again just to get a new excuse why they don't have the parts yet to repair the phone. I have reported this to Samsung Customer Care who has now intervened to order the parts through another service center however, the repair must still be done by User Electronics because they have been paid upfront. This is the worst service I have ever experienced and the staff, including the owner, has a "there's nothing we can do" attitude towards resolving the problem.