Furious

Good day, i've been receiving calls for almost 2yrs from MDB debt collectors ***; +***3) asking to speak to my brother. I have given all numbers that i have of him but yet they still calling me to ask to speak to him. I received a call from them just now when i pleaded with them again to please remove my number from there system and told them that i will lodge a complaint against them. Just yesterday i told the lady calling me to remove my number. They informed me that the number was given to them by him. That is a lie because he confirmed that he will never give my number to retail companies of any other accept for family. They told me now that they will start to charge me for the calls. I am so furious with these people already. I have blocked them on my phone but then they just make use of another number. Please help!!