My visa sticker doesn't make any sense

I have applied for a business academic visa short duration.and was accepted however both the entery and expired dates on the sticker are a month earlier than what I have written s my arrival and departure dates in the application form also the field next to the duration of stay is left blank .i think it was an error from ukvi should I wait till I reach the uk and apply for correction to be fixed or should Iattempt to fix the error from Egypt ?

No, you need to correct it BEFORE you travel to the UK.

If you clearly stated intended travel date, it is UKVI's error.

How do I correct it and how long will it take? I am planning to travel in 25 days

And regarding the empty field next to duration of stay ,was this also an error or does some types of visas have that field empty?

Contact the British High Commission or the visa application centre where you applied.

So now I have contacted the UKVI and they said that they will escalate my case to the responsible department,how long will this process take ?as I am about to travel in 22 days from now ,don't want to miss my elective for a mistake the UKVI did