Here's what you should do immediately:

1. Contact Bharathidasan University:

   • Visit the university website and find the contact details for the MBA department or exam cell.
   • Call them and explain the situation clearly. Mention you paid the fees but entered the wrong registration number.

2. Provide Proof of Payment:

   • Have your fee payment receipt ready. This will help verify your payment.

3. Request Correction:

   • Politely request them to correct the registration number associated with your payment.

4. Follow Up:

   • Ask for a confirmation email or reference number after they rectify the issue.

Obtaining the Hall Ticket:

• Once the registration number is corrected, you should be able to download your hall ticket from the university website.

Regarding Your Payment:

• Since you have proof of payment, the university shouldn't charge you again.

Act Quickly:

• Time is critical as exams are next week. Every minute counts, so prioritize contacting the university.

Mistakes Happen:

• Don't feel discouraged. Focus on resolving the issue as soon as possible.

Reach out to Bharathidasan University as soon as possible. You can find their contact information (phone number and email address) on the university website  or the department website handling MBA admissions/examinations.

Explain your situation clearly. Inform them that you mistakenly entered the wrong registration number while paying your MBA semester fees and haven't received your hall ticket yet. Exams are next week, and you'd like to know how to rectify this error.

When contacting the university, have a copy of your fee payment receipt ready. This will help verify that you made the payment even though the registration number might be wrong.

The university will guide you on the process for rectifying the error. They might ask you to submit a written request explaining the mistake and provide a copy of your fee payment receipt.

Follow their instructions carefully and promptly to ensure they have enough time to process your correction before the exams.

There might be a late fee associated with rectifying the error at this stage. Be prepared to pay any applicable fees.

https://www.careers360.com/courses-certifications/articles/how-to-apply-for-online-mba-at-bharathidasan-university-tiruchirappalli

I hope it helps!