Can someone please help me with matched betting?

I am having some trouble with matched betting. Can someone please help?

I am trying this for the first time. I am trying to earn more money for my family.

I am using www.savethestudent.org/make-money/what-is-matched-betting.html#comments as a guide.

Here is what I have done so far:

Back bet - Leicester City vs Sunderland

Paddypower - I bet £10 that Leicester City will win (odds of 2.25)

Betfair - I placed a lay bet that Leicester City would not win (odds of 2.30) Liability amount = £12.88.

Result = Sunderland 0-2 Leicester City

Paddypower total return - £22.50 plus £10 free bet NOT £30 free bet like the guide says I should get.

Free bet - Deportivo La Coruna v Las Palmas (tommorow - 11/04/16)

Paddypower - I used my £10 free bet to bet that it would be a draw (odds of 3.25)

But according to the guide I should have had a £30 free bet to use!! Instead I only have £10.

Why is this?

Will it still work?

Should I bet another £20 from my remaining balance to bring it up to £30?

My remaining balance is £22.50

Thank you so much.

P.S. None of this is showing up on my online bank account. Why?