Can I request a cancellation for a pending payment which I was not intend to renew.

I have tried the LinkedIn premium subscription trial period and I didn't receive an email regarding the renewal of the subscription. It's now on my pending payment list and I did not intend to purchase this at this time as it is difficult for me to afford right now. How can I request for a payment cancellation for this?

I have already cancelled the subscription. This payment has been charged through iTunes account but without any prior notice.

How can I get a help to cancel this payment?