Disappointed with no sim swap

I am very unhappy with Vodacom as a new contract holder. I took out a contract with vodacom online thinking that I could just do a Sim swap to my old number I have had for over 10 years. I went into Vodacom only to be told sorry this cannot be done. This is ludicrous, when I did the contract online they did not give me the option and if it was there it was not very transparent. I do not want another number I want to keep my old number. This is not the first issue I have had this week it was such an issue trying to cancel my deceased husbands month to month contract, so much red tape. If this is what I am going to have to deal with, I don't think I will be recommending vodacom again after many years of being a loyal customer. Disappointed is an understatement.