Time limit to issue refund under VSVS Act 2020 by AO?

My form 5 under VSVS 2020 has already been issued by the department 4 months back granting me refund. The same has not been issued by the AO to us, even after 4 months of issuance of Form 5. Kindly update me with, what is the time limit for issuance of refund under VSVS 2020 & where we can file complaint against the AO? What is the process of filing a complaint against AO to PCIT for not issuing refund under VSVS 2020?

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