Harassment at my work

I am sick and tired of this company !! AFTER arrangements were made via email, as i responded to an email, they just keep on calling. I have had 3 different people call me from the same company just today! Why does one person not handle the file??? Why are there so many different people???? I am going to post on every social media platform and mention all names i have sent emails to and sent arrangements too but it seems like no-one reads their email or they do but they just feel like bothering a person further! I have had enough of them constantly calling my work number when i am busy! I f!@#ing work !!!!! Remove my number and update your system so that you can leave me alone!