James R.
Undelivered promise and manipulative staff
The sellers didn't provide what they promised me, changing what service they provided (crap power bank) from the one I paid for and was promised in advance (limitless charging behind the desk) with no prior warning. Being at a festival, I was left me with no other alternatives and I would not have done this if I knew in advance (which of course they did). The staff also tried manipulating me into taking the unfavourable option and into keeping chargers if they weren't completely empty. I had a poor and similar experience with them at last year's festival, too.