disgusting service in MTN Brits mall

on the 05 of march 2018 phoned my daughter who had my phone with cellphone number contracted to MTN. I went to MTN in Brits Mall did a sim swop and paid R113. 00. for sim card with my change of R37. 00 because i tendered R150 .00. i requested recept for my payment which i did not get to this day and no explanation was provided. the lady who helped me informed me that the sim swop might not go through as the person who stole my phone might press no , on request to process sim swop which told me that the ***** had more control over the simcard than me. i told the agent on the counter who responded that ," that is not MTN 's problem it for to sort out the ***** " .i told the lady that in this case i need receipt so that i ca return the sim card if that ***** is using the other sim card.she refused and told me that she is preventing ***** , this time she gave me a negative attitude, the other lady who was seated on the other side apologized profusely and advised me to come back if the simswop did not go well after 24 hrs.she informed me that there is an internal process. which contrary to the first one who said there is nothing she can do.please not i paid for the sim card , that make s me the client let alone the contract that i pay on monthly basis..