Bought cartridges for an Epson printer. Test pages were just streaks of ink. Did all the usual printer cleaning methods such as cleaning heads, printing several test pages, etc, Replaced cartridges with official cartridges and printed perfectly.
Contacted seller to ask for refund, in his defence he gave us a free postal address to return the item. However we haven't received a refund for the faulty cartridges.
3 weeks later and no refund. Looks like we'll have to resort to small claims court in order to get a refund. A seller to avoid at all costs.