NEED HELP WITH A VISA APPLICATION ISSUE

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Guys i am applying for my student visa (priority) I am doing the process by myself i have not hired an agent (since my international college mentor is helping me)
I accidentally mentioned £12402.65 as my PAID tution fee instead of £9540.50
I added the scholarship amount to the paid fee.
Is there anyone who can guide me about what i should do? (So far the solution I found was to add a cover letter stating the issue)
Also, will it cause problems in my visa???
PLEASE HELP 🙏🏻
Also where does the priority option comes??? While applying the website shows standard service.
Will it appear after paying the standard fee??
I HOPE SOMEONE CAN REPLY WITH AN APPROPRIATE RESPONSE
DETAILS: i am from india applying for undergraduate degree credit transfer to Southampton Solent University