Request for Additional Credits on Pro Plan for Special Project

Hi, I'm a Pro plan user with 150,000 credits per month. For a special project, we had to use around 130,000 credits, and I'm wondering if there's a way to purchase additional credits at the same rate I pay for my current plan, rather than paying the higher price for extra credits. I'm asking because I can't upgrade further through the platform, and when I contacted enterprise sales, they're unavailable until next week. We need credits for our team to continue working in the meantime. Can someone help me with this?