Cancel the contract for Data sim card after 24 Months term completed.

Hello, 

I want to cancel the contract for my additional data sim card. The contract term is already completed and its already terminated & I do not want to continue the data card. 

Can someone help me with the process of cancelling the additional sim card. 

BR,
Makarand

Edit o2_Sven: Moved to English o2 Community: Mobile