Claim of relief u/s 89 disallowed inadvertently.

I received message from department on 17-December-2020:
Claim of relief u/s 89 of IT Act disallowed inadvertently. Error is regretted. Order u/s 154 rectifying the intimation would be issued expeditiously.

But till date no order rectifying the intimation has been issued due to which I am not getting my refund. What to do now ?