Had a really poor experience with this company. Ha...

Had a really poor experience with this company. Had a sales call from them during a work day for a desk I has interested in, placed a order but then 1 hour later remembered I had a promotional offer which wasn't applied, call them back to cancel the order and reorder with the promo offer. Said I need to speak to a manager. I got a call the next day to advised me not to cancel the order by a manager "Colin Connell" and that it will be easier for them to sort it out on there end, and partial refund it directly. 1 week after the desk arrives and then the next day I got an email from someone called Greg McIvor saying sorry but on this occasion we will not be giving you the promotional offer... This is practising in complete bad faith and really surprised of how unprofessional this is. I email them back asking why they didn't just cancel the order in the first place as I requested, it's been 20 days and no response from Colin Connell or Greg Mclvor.... I kind of feel conned, so just be careful guys...