Deals on Tap Leave Us Alone

I have been getting calls from Deals on Tap and advised on a few occasions that i was not interested. This time I questioned where they goy my contact details from, as according to the POPI act I have a right to know. The "agent" immediately hung up. I called back the number shown on my phone and got a recorded message saying the number does not exist. Obviously Deals on Tap does not want t be traced. Their web site also has no contact details. LEAVE US ALONE!!!!