Well first off I highly doubt we owe you 3.5 millions credits...
It looks like you traded multiple times with our bots.
5:27:40 PM [INFO] Starting trade session with STEAM_0:0:44652465!
5:28:55 PM [INFO] Trade ended: PendingEmail
5:28:55 PM [INFO] STEAM_0:0:44652465 paid for 4685 credits, but is pending email confirmation. Trade ID: 514703906
5:29:56 PM [INFO] Trade-offer 514703906 for STEAM_0:0:44652465 completed successfully
5:29:56 PM [INFO] Giving STEAM_0:0:44652465 4685 credits for their trade
5:35:42 PM [INFO] Starting trade session with STEAM_0:0:44652465!
5:36:33 PM [INFO] Trade ended: PendingEmail
5:36:33 PM [INFO] STEAM_0:0:44652465 paid for 35565 credits, but is pending email confirmation. Trade ID: 514711621
5:37:34 PM [INFO] Trade-offer 514711621 for STEAM_0:0:44652465 completed successfully
5:37:34 PM [INFO] Giving STEAM_0:0:44652465 35565 credits for their trade
5:37:48 PM [INFO] Starting trade session with STEAM_0:0:44652465!
5:39:12 PM [INFO] Trade ended: Canceled
8:11:30 PM [WARN] Unable to trade STEAM_0:0:44652465: Declined
You also spent 15,000 credits buying 30 days of VIP access right after declining a trade...
L 06/06/2015 - 20:13:01: [vip_sql_admins_expire.smx] ADD - Proccessed command: "STEAM_0:0:44652465" a 43200
L 06/06/2015 - 20:13:01: [vip_sql_admins_expire.smx] ADD - Adding admin: 76561198049570658, flags:a, time:2592000
The bot logs show donations as having been successfully paid and there is no other errors to support they were not paid out to you. The fact you spent 15,000 credits on VIP as well supports you having received your credits.