Suspected ****mers working at The Courier Guy

I'm most concerned that, whenever I get the first notification from Courier Guy that a parcel is on the way (from a specific supplier), within 30minutes I get an sms from a ****mer that I need to pay a certain amount. There is someone at Courier Guy that is either the ****mer, or supporting ****mers. I called Courier Guy HO to see if the info can assist them, but the phone remained unanswered. I've given up, but Courier Guy, you have an issue andthe bigger you become, the greater this risk will become.