This is not a sales call

'This is not a sales call.' This was how a call started. The caller proceeded to invite me to a launch of a new property, saying that they will be giving me some free gifts and that there is no obligation to purchase. I told the caller that he is lying. This was a sales call. He protested that there is no obligation of buying. Doh. In any case, I didn't bother, I put my mobile in my drawer and left him to talk. He didn't get the message. He hung up and called back.