We suggest that you contact immigration@mmu.ac.uk in the first instance, including your student ID number.
If there is an error, with your consent and current UK address we can report the error for you.
Otherwise, you need to submit a BRP correction to UKVI. Students are advised to go through the UKVI and UKCISA website here (Biometric residence permits (BRPs): Report a problem with your new BRP - GOV.UK (www.gov.uk)) and (UKCISA - international student advice and guidance - Passport, visa and BRP problems).
Please note, UKVI require that the University reports any BRP errors it is aware of to them directly however this may not result in a correction until you have also submitted a correction request.