Sorry to hear you haven't received your payment yet. We approve payments and then Linkshare makes sure they are sent to you in the way you selected for your payments to be sent out.
To contact Linkshare you can email them or call them directly.
For email support: email@example.com
For phone support dial this toll-free number (US): +1-888-880-8430
If you are outside the US, here's the list of international numbers you dial to instead.