Vodacom welcomes me

On 8 June, I received a welcome message from Vodacom *** giving a new number *** and an option of keeping my old number. I have had no intention of doing business with Vodacom whatsoever. I visited the shop in Hemingways Mall where they could not help me except to be told that I am not on their system and I share the same number with someone else. Their 24 hours deadline is just after 17h00 and I do not want to be with them.