Purchased a donation from a reseller. Worked good for a week or so then down. Checked the donation with a checker and said the donation was not valid or expired! Contacted seller and explained issue. Was sent another donation and it worked for a day or two then down. Checked donation and same as above. Repeated same with seller again and received another donation. Worked for one day then done. Same as above. Comtacted seller a fourth time and no response! Suggestions?