Change of status from H4 to H1B

I moved to US on H4 visa. My H1B petition got approved last year. Now my consultancy helped me to file for change of status from H4 to H1B in premium processing.

Its been more than a month but still there is no update on the Change of status application. When I asked my consultancy they are stating that the cheque itself is not deducted yet by USCIS, hence receipt number is also not yet generated. They stated that USCIS might do so in order to delay the premium processing if they have backlog.

I am not convinced by their statement. Is it really a possible scenario ? What are the steps that I can take to verify.

Kindly request your assistance on this.