Betfair won't suspend accounts just because you have exceeded their free data request limit. They will simply charge you for further breaches, so that can't be the reason for your problems. Have you tried reinstalling the program? However, you still need to contact Betfair to ensure there are no other problems.
When you have it working again, make sure your total requests from both accounts don't exceed 20/sec. Also remember that using the website adds to data useage at twice the rate of the API.