Partserve customer service

Worst service ever. Booked in a printer in Oct 2020 for a repair. Copying and printing half blank pages. Got quoted Jan 2021 and received the printer back March 2021. When I received the printer, all of a sudden the feeder was broken. I left it (Obviously my mistake, after numerous emails for them to collect the printer) and took it in to Partserve Nov 2021. They charged me again and repaired the feeder. Yesterday, 28 Feb 2022, I went to collect the printer, just to find out the printer now prints vertical lines all over the pages. They could not understand this as there were prints laying on the printer that printed perfectly during their repair period.. The only explanation is that somebody must've fiddled with the printer between the time they repaired it and the time of collection. Needless to say, they just pulled up their shoulders and said they don't understand this and just booked it in again. While I was standing in the line waiting, there was another person claiming he has received his notebook back in a worst state than when he booked in the unit, without buttons. Now can anybody explain to me how OEM's like Lenovo and Epson keeps on using these people for repairs with these types of customer service. When I looked at their reviews on Hellopeter, I was absolutely shocked to see the ratings. I will keep you posted on the progress of my printer.