Tornerpartner review: printer toner

This online company sent me a toner replaicement that I never requested . I reported that I toner I purchased was not working properly and they decided without my consent to send a more expensive replaicement and they expect me to pay for it, I offered to return it as I really don't want to spent all this money on a toner Cartridge and I asked them to pay for the courier to return it but they never arranged one. Instead they keep mobbing me to pay for the toner, and not only the more expensive one they sent of their own decision but also I have to pay for the faulty one they refund. I wrote to them many complaints asking to stop but they just keep on emailing invoice after invoice.