Paying without using the sim

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Paying without using the sim

Hi , myself prashanth raman had took a postpaid sim of 150 plan last month from one of your guys from tasheel al nahda . Since he said sim free I mistakenly took and then came to know that it was a postpaid .. and same time told to do without any contract types .. since I didn’t even open the sim yet and today received a call for the payment of bill.. why should I pay when I never used or consumed it ? I can return the sim since it’s same as it is .. and the lady who called said if want to cancel have to pay extra 300 .. this is ridiculous when it’s out of any contract types .. can anyone assist me more on this .. would appreciate ..
Thnx