HARASSMENT FROM TRUWORTHS ACCOUNTS CALL CENTER!!!!!!!

So I have been receiving calls from Truworths call call center looking for an individual with outstanding accounts. I receive up to 6 calls pre day. The more I tell them this is not this individual's number the more they call. I have told them to take my number off their system but they continue to call. I am sick to my stomach of these people phoning me. I have started screaming at them and even asked for a Supervisor and spoken to them. TRUWORTHS THIS IS NOT HIS NUMBER!!!!!!!!. Truworths is literally harassing me. Stop phoning me!!!!! You should perhaps do more screening before giving peoples accounts that don't pay................