Annoying calls & sms to my number( I'm not the person they are looking for)

Why does this company verify their client's phone numbers before calling & harassing innocent people 🤬 I am constantly getting calls & sms regarding a so called Zintle Mkize's(I don't know this person) truworths account. Why don't they check & verify with RICA who the number belongs to. I have had this number for more than 10 years& it is a contract number with Vodacom so it will be easy for them to confirm. All their agents are useless coz they continue calling despite me telling them they've got the wrong number. So annoying