Incessant harassment for debt which is not mine.

I have been inundated with phone calls from this firm for Standard Bank credit card debt which does NOT belong to me. This is the last message received-

Standard Bank CARD Payment Reminder : Please reply today with an amount that you can afford to pay by 30 July21, make payment to Standard Bank ***. Brooks&Luyt Inc.

I have emailed them to inform them of my intention to lay a formal complaint with the Law Society, as well as the Debt Collection Ombudsman should they choose to not desist and remove me from their database. I am sick of them, quite frankly. They are not even professional enough to include a reference number or contact details on their sms correspondence. It absolutely beggars belief.