Worst service or experience yet

Booked in a Samsung laser printer for repairs, was informed they wont work on it without new cartridges and a new imaging unit, handed over brand new items, waited over 2 months for repairs, paid for repairs only to find out, the unit still doesn't work, they collected it, 15 days later we were informed they cant fix it, said I will get a refund, still waiting, printer was sent back only to find out they sent back someone else's printer, now i don't have my printer with new cartridge's or imaging unit or a refund.