Disrespectful and forceful Sales Agents

On the 27th January a sales team entered our private premises in Paarl (factory). They informed the security guard that they were on site to see another client of theirs based in a different building (but share a common parking space). Their client advised us that there was no appointment made prior to their arrival, they just arrived at his place of work without authority. Once their meeting was over, they entered our factory. The receptionist was not at the front desk so the unattended sales agents proceeded to walk upstairs and opened the doors of closed offices. Once we found out that they were going through our offices we asked what they were doing and they told us they are here to sell us products. We are not interested in these products. This is a place of work - make an appointment. We gave them our details to book an appointment but they told us that they don't make appointments. The lady was rude and disrespectful. THIS IS OUR WORKING HOURS, in a factory that means PRODUCTION.. we don't have time to switch off our machines so you can address our staff when you want! Speak to the General manager first and discuss the products and if it is even applicable to our staff..