disappointed in Telkom

I cancelled my contract in Nov 2017 i asked for my number to remain on prepaid .Ive been using my number since up until 3rd October2018 I bought a data bundle of R100 on sat 6 October only to find out on 8th that my number was given to someone else .I have proof on my mobile phone that Ive been using this number msg was sent back and forth on this number .I feel utterly disappointed in Telkom .When i spoke to the consultant i didn't even get an apology yet he could hear my frustration all i got was sent me you bank statement for refund of Data .only to find out it will take weeks for this R100 to be refunded .Its not even about the money its about the service and the lack of notification of this number being given to someone else .I still have another contract with Telkom Once this is done I will never do business with Telkom ever again my expectation is that you reinstate my number and provide me with a reasonable explanation as to why the above was done this was a number that my daughter used to get in contact with me as she is still in school .