sales person does not know his product, or just kept quiet to get a contrat

went into Cell C store to find out when I can upgrade. The contract is in my (deceased) husbands name, but I paid the contract every month as I use the phone for my business. I told them that I will have to cancel the contract when it is time to renew as it is in my husbands name and he passed away. I was then told that I can cancel immediately seeing that my husband is deceased, and that it will cost nothing to cancel/terminate the contract. i told the sales person that I would like to take out a new contract then, but keep the number as I use it for my business. He said no problem, it would take 24-48 hours to have everything sorted. It is now 3 days later, and nothing, so I went back to the store this morning only to be told that i cannot keep the number, unless I pay +- R2100 to cancel the old contract and keep the same nr on the new contract or keep the contract untill I can upgrade, which is in June2018. THAT IS NOT WHAT I WAS TOLD FROM THE START. who is going to pay for new business cards, letting customers know that I have a new nr etc et? I feel the sales person was not honest with me, and just wanted me to take out a new contract. he also now says I never told him i want to keep the nr!!! fortunately one of the other sales persons knows that i told him i want to keep the old nr, what now?? can i still cancel the new contract? the old contract has been cancelled, so that nr is no longer in use, so i am loosing business!