My account ran out of Space

Hi i purchased the Bronze package which states limited submissions, and now my forms are disabled, why is this?

Hello,

I checked your account and found that you have received more than 1000 submissions, which is thus above the limit for Bronze. You will need to upgrade your subscription to Silver in order to remove your overlimit status. Would you have an idea what's the average of submissions that you receive in a month?

Thanks.