Calling after telling them I bought somewhere else - 3 months later

Maxidor must have the slowest people in the world working for them. I requested a quote over 3 months ago for security gates and was quoted double for what I actually paid for them from another provider. The big issue is that these muppets call me on a daily basis to enquire whether I need security gates. I have told the sales people, the sales manager and anyone else who call that I have purchased from someone else - Please take me off your list of people to call - you are wasting time and money and irritating me !!!!