Fraudsters! I was selling an Iphone 12 and Iphone X, both in pristine condition, in original boxes with accessories (they had screen savers and Otterbox protected since new). I sent them off in the hope that they would come near the £300+ cash listed (subject to condition). They offered £10n for the Iphone X and £70 for the Iphone 12 because they had"marks" on them. I know they did not as I would never have sold them. I paid for them to be returned and then the hassle began.
The offer was increased by £20 overall but I insisted I wanted them back. I kept emailing and having replies saying I would save the postage etc if I took the offer.
After 2 weeks+, I got fed up and accepted a slightly increased offer due to the fact that my wife said to do it. I guessed they had already sold them and then tried to wear me down. If I lived closer to them, then they would see an angry man! I am sure they do that with everyone who tried to sell them a phone.
These people are fraudsters in my opinion and anyone who deals with them should be aware. DO NOT TRUST THEM!