What a bunch of con artists, I'm seeking legal adv...

What a bunch of con artists, I'm seeking legal advice. I had 1500 remaing on my original loan which I already paid interest on, I then barrow another 3500 and they charge me interest on 5k, so I paid interest on 1500 twice, but they don't tell you that, nor does it state that in the contract. Stay well away , they are the worse loan company out there. Lies ,deception and try to make u more in debt by messaging you every 2 weeks to top up so that they can make double interest . I will take legal action against these .