Yes, aid can increase in the summer when credits are added, as long as they are added in the drop/add period (they won’t count for financial aid purposes if added after the end of drop/add, even if your professor allowed you to be added). But if your summer courses are in modules, those credits can kick you up to the point where you may get increased Pell … or if you have remaining loan eligibility for the year, you could get a loan. However, you would need to request the summer loan, most likely.
The person you spoke with in the financial aid office needs an attitude adjustment, if you were really given that answer. Yikes! Not cool.
We cannot answer this question - only your school’s financial aid office can answer it. Please contact them again, and my guess is you’ll get a better answer.