Vodacom wont allow me to do a simswap

I have been a vodacom prepaid subscriber for over 15 years and they simply refuse to do a simswap for me. After spending hours on the phone with their agents I was told I am a contract customer of which I have never signed up to. I have made all attempts to recover my number which was lost on the 25th of June. I don't know how many simcards I bought doing this sim swap but I have lost a ot of money in my personal capacity and business The number in question is *** and I have never used any other number besides this. 15 years is a long time but Vodacom has manage to fail me this time around.