Increasing the limit of the monthly received money

[igists]

I tried to increase my limit several times, as in the instructions below:
To request an increase in your release amount:

1. Log in to your PayPal Business account.

2. Click the Pay & Get Paidtab at the top of the page.

3. Under 'Wallet', click Money.

4. Click Request an increase under "How to help get your money sooner."

5. Select the appropriate amount.

6. Click Done.

Each time I get a message that it can not be done now, and to try in a month, I tried to do it already 2 times. The same problem every time and I have to wait another month.

I have only 400£ limit... PayPal is withholding (for a maximum of 21 days) any money above £400.00 GBP in sales each month
It is a terribly tiring waiting for money 21 days, the problem is that I cannot add a tracking number because I have my drivers who deliver my goods