The Pro plan allows up to 50,000 profiles per search (not 25,000 as mentioned in your question). If you need more credits, you can purchase credit top-ups directly from your billing modal without changing your plan. These top-ups cost 50% more than your regular plan's credit rate.
The credit cost per person or company varies by data point and provider, not by exceeding plan limits. Most actions cost 1-2 credits, but some data points are more expensive:
** Emails: 2-5 credits depending on provider
** Mobile numbers: 2-25 credits depending on provider
If you exceed your Pro plan's 50,000 profiles per search limit, you can purchase credit top-ups at 50% more than your regular plan's credit rate.
There is a limit of 50,000 rows for a table and for the search in pro plans, so you should be able to add more than 25,000 companies/people. Are you facing any errors while doing so?