Harasing the wrong person for about 2 years

I have received sms and phone calls from the attorneys, RL DALY for approximately two years regarding an outstanding Cell C account who belongs to a B. Ndlela case nr680043/07/15. NOT ME! NOT MINE!. I still receive these calls and sms even after taken the effort to inform them of their error. It is embarrassing to explain its not your account when co-workers are watching and listing. What will it take for RL Daly to put two and two together and realize they are contacting the wrong person?