PAC code trouble

hi there I hope someone can help I have purchased  a  smarty sim  which I purchased from a store in which I entered a pac code from my original  phone provider  but I had  problems activating the sim ,  when choosing a smarty plan it  redirected me to buying a plan & posting me the SIM card  through the post which I did . When the sim came from the post i activated & tried to use the pac code but it kept saying error so I contacted my original phone provider & they said the pac code had been used on the the first smarty sim I purchased from the store  so i manage to get the first  original sim purchased from the store activated & tried to insert the pac code once  again but same thing error the problem now is the pac code is now been used on the store SIM card but the number is still a smarty number not my original number so I want to know if the number will switch over or is my pac code lost in the smarty system because my original provider can’t generate a new pac code as smarty have taken it ? Sorry for the long drawn out question many thanks.