IT refund for AY 2018-19

With regard to AY 2018-19 refund was rejected because of incorrect A/c No. However no communication was issued regarding it and was unable to raise a refund reissue request. When I called CPC, they asked me to reprocess it so that a refund rejection is issued to me. A week later the rejection notice was issued. But now reissue request is being rejected saying that reprossessing is pending. It is almost three months now. Refund amount is also big. Kindly help