My visa sticker doesn't make any sense

[Alimohamed1191]

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 ?

[CR001]

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

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

[Alimohamed1191]

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

[Alimohamed1191]

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?

[CR001]

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

[Alimohamed1191]

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