bad attitude if front of customers unprofessional

As per above mentioned. I went into the store to do a sim swop on my mtn 3g card. I was asked to produce my ID in order to process a sim swop, after going back to my vehicle to retrieve my ID. I arrived to find the employee from Mpumalanga secunda mall MTN giving a different customer a new contract/upgrade with the customer only producing his drivers licence. What's good for one is good for all. Why must i produce my ID where as others produce the drivers licence.<br> <br> <br> I feel as a loyal customer to MTN I have been singled out only to produce my ID. I received terrible service from the employee, he refused to give me his name and we escalated volumes within the store drawing attention to others around us, he furthermore insulted me in his language calliing me a \stupid". This is totally unprofessional. Especially working for a company like MTN.Some one needs to see into the rules for verifying identity due to it being unfair for different applications. I would like further action against this employee. He can be singled out if I have a MTN representative with me. Your response will be highly appreciated. <br> """