Is it Normal to Pay for Touch Up if There Are No Results?

Dear doctors, I have had three lip augmentations. My first one costed 420 Euro. After my first injection I complained of the results. So he injected more, for free. After few days I was not happy again, because I could barely see any change! So I was there again, he charged me 210 Euro! Now it is still not like I wanted to have. I can´t afford more money. Is it ok that customers pay and pay for little filler every time? I´ve paid the TOTAL and didnt get what I paid for at all.Thank you regards