Correction of GST no. in return filed

Dear All,
Can you please help me out. One of our debtors has provided wrong GST No. and we have billed him as per the GST no and name provided by him. Now he want me to change the name and GST No. I have tried to make corrections through GSTR -2 but it's showing option for correction can be done in tax rate our value but not in name of the assessee.