Unsubscribe me! Netflorist won't let me go

They say the best way to demonstrate unhappiness with bad service is with one's feet. Well, I have been trying to walk away from NetFlorist using their unsubscribe button but they just change their address and carry on relentlessly. If only their service reflected some of this determination but my most recent experience left me certain that I didn't want to support NetFlorist again. I had placed an order for a birthday boy in Cape Town and when I saw that NetFlorist gave me the option of a Sunday (the exact day) I confirmed my booking. However, with qualms about this likelihood, I phoned NetFlorist and was reassured my order would be delivered as promised. Near lunchtime on the Sunday in question, I received a phone call saying they wanted to change my order as it wasn't up to scratch. The chap who called me was in Johannesburg and he said he would have to get back to Cape Town ASAP. He called again to make a suggestion I really did not like and he said he would have to stop the driver who was on his way with their substitute. I made a choice of two plants. This entire interaction took place within an hour. The messenger bearing the news called me back to say there were now no drivers available. In other words they just didn't deliver. No-one called me to apologise and it was left to me to pursue my refund, which they planned to use towards my "next order". A grudging apology and reimbur*****t eventually followed but there was no attempt to redress my unhappiness at missing the birthday in question. My decision was easy, I thought. I unsubscribed. Now they won't leave me alone. Will a review on hellopeter succeed where all other attempts have failed?