I purchased a refurbished Samsung Galaxy Z Flip5 from GiffGaff, and within a year the screen developed stuck pixels despite no physical damage to the phone. I returned the phone under warranty, fortunately haven taking pictures from all angles before mailing the device. GiffGaff have now replied with a photo of the phone showing a significant amount of new damage that 1) I can prove was not there previously thanks to the pictures, 2) physically could not have happened during transit, 3) they are now attempting to charge me £302.00 to repair. I can only assume that the damage was caused by the repair centre staff, whether intentional or not, and they are now blaming me for the damage. I have raised a complaint and have now been refused the repair under warranty that I am entitled to. Do NOT buy any refurbished phone from GiffGaff unless you are fine treating the warranty as worthless, as otherwise they will put dents in your phone and charge you hundreds of pounds for the pleasure.