Mismatch between itc claimed and gstr 2a, due to some of the clients have not filed the gstr1

Dear Sirs,

Please to clarify,

I have claimed ITC as per INVOICE, but the concerned client has not submitted / transferred ITC to my GSTIN.

I have original INVOICE COPIES with me. Further, upon searching concerned client GSTIN, found that, some the clients have cancelled the registration and some of the clients have not filed the GSTR1.

In this case whether i need to reverse the ITC availed OR im allowed to claim ITC as per INVOICE?