PUSHY SALES

In March 2019 I was called by a sales person from C & N Imaging Products who convinced me to purchase a printer cartridge. Although it was 3 times the price I usually pay, his sales pitch was it would last 4 times longer than other brands. I ordered one cartridge which arrived and I paid for it. I have been contacted since by another lady who claims that the agreement was that I have to purchase another cartridge to get the discounted price? There was no such agreement made between me and the sales person and this was not mentioned at all. Today we had a call from an apparent "legal advisor" who sent my boss the purchase order, which was actually used as a cash sale when the cartridge was delivered and signed for by me when I paid cash for the cartridge. The legal person sent the email from a gmail account which is dubious indeed. We have responded and will not be bullied by pushy companies desperate to force sales by using non existing agreements as an excuse.