MDB block them

I'm am gatvol of MDB harassment on our business number looking for people that don't exist. MDB staff are rude, aggressive, arrogant and obnoxious! It's time that MDB is shut down. If MDB is not harassing us with voice calls they make use of an auto dealer. MDB's staff don't have a problem abusing and threatening whomever answers the phone. When asked who is on line they will refuse to tell you. MDB keeps changing their numbers so that you cant block them. Our staff has been instructed to answer MDB calls as follow " F***I off" and hang up the phone and block the number on the switchboard. Two wrongs don't make a right but as no one wants to take action against MDB not even the SAPS will let you lay a harassment charge against them, don't even try to lay a charge in terms of the electronic communication act. If we all treat MDB the same way and dont talk to them they won't be able to keep harassing people.