Deleting emails does not make space

Good day.
I had this problem before and I know this asked here before.

Is there any way to push emclient to actually delete emails without delay.

I have only 200mgbyte left in my driver. This week I deleted over 20.000 emails , should make gigabytes free now, but after 3-4 days , it is still few hundred mgbyte freed, I am still struggling to make a free space to receive new emails.