Hammond Pole Harassment for Vodacom account I was never responsible for paying

Having recently cleared my name with MBD who was previously harassing me about this matter - I have now started receiving SMSes and calls from Hammond Pole concerning payment of a Vodacom business account that I was never responsible for. The account in question is connected to a closed corporation that I was employed by and left more than 10 years ago now. The company continued to do business after I stopped working there and was then acquired some time later, so no longer exists in its original form. I was not personally responsible for paying any business accounts during my time with the company and am certainly not responsible for any outstanding accounts that were generated after my time of employment there. The mere fact that you have somehow found a connection between me and this company is not grounds for me to have to pay their outstanding bills and I will not do this. I will continue to ignore you indefinitely should you continue to persist, but you are unduly harassing me and I politely request that you stop doing this. I can not stress firmly enough that this account is not my responsibility and you will never receive any money from me in connection with this matter. Thank you.