Constant text messages about an NHLS account

For the past year, I have been receiving SMSes asking me pay an NHLS account of which I have no knowledge. <br> I have asked various callers to email me the account concerned for perusal, but this never happens. <br> <br> I have even used the online email available from the company's website to no avail. I even explained to a caller from this company that my bills get submitted to my medical aid.<br> <br> The last reference I got, this morning at 10h50am was ***.<br> <br> I'm thinking of sueing for harassment, but thought I'd try HelloPeter as a last resort.<br> <br> Thanks very much.<br> <br> Louen