Input Tax Query

Dear Sir / Madam,

For FY 18-19, ABC company purchase the goods from XYZ company for an amount of RS 150000 including GST every month, and ABC company claimed the INPUT GST every month.

However XYZ company files the sales to ABC company in GSTR1 under B2C throughout the year.

Now ABC company got a message from GST departmental there is a excess claim in input tax.
Also Input reconciliation is not matching between GSTR2A and Input availed.

ABC company request XYZ company to file the sale against them in GSTR1, but XYZ denies to do that and said they already filed the GST in B2C (sales to unregistered person).

Is there any option or solution for ABC company to come out from this issue? and to avail the actual GST they paid for their purchases?