VAT Submission errors

Hi everyone, not sure if anyone can help.

The business has submitted an incorrect VAT return (Monthly Returns rather than quarterly). The figures for Apr 2021 have been submitted for May 2021 by mistake through sage. Meaning that Sage believes the April return has been submitted, whereas HMRC believes April has been missed and only May has been submitted.

The issue lies with resolving the error on sage. If i amend the May return to the correct May figures through HMRC Form 652, I risk throwing Sage out of alignment with the Filed figures.

Is there any way to amend Sage to re-submit the correct figures for April and then amend May separately? 

I'm very baffled and this is the only place i could think to find answers.