Poor service! Not paying attention.

We have 2 contracts with Vodacom we went to get a 3rd contract for the lady who works for us (should she needs to reach us for an emergency with the kids) we got the 3rd contract in December (only the phone was given as we used the number she was currently using) when she returned to work yesterday we gave her her phone and noticed that her sim card was too big we came back to the store today to do a sim swapp to get a sim card that would fit the phone and noticed that the guy who assisted us used the wrong number and not the number we provided. So now he is going to cancel that contract and put it to the correct number. What about the airtime and data that was given the the wrong number? Will be be liable for paying for vodacoms fault or will we be re immersed? Every time we deal with Vodacom the help is very very poor! The guy who assisted us both times is Sizwe from the Grove store at Nelspruit Mpumalanga