Refund of the amount paid to an immigration agency for breaching the agreement terms

We have signed an agreement in October 2020 as a “UK Start-Up visa” with immigration advisers in the UAE. According to the agreement, we have paid AED 25000/- as a full package to get the visa.

After submitting the application and following up for the last 6 or 7 months, they are now disclosing and asking for endorsement fees of 50,000/- GDP, which need to pay endorsement bodies for 2 years.

Earlier, they did not inform us nor mentioned it in any article of this agreement, which shows it was hidden from us at the time of signing the agreement.

Due to this reason, we do not want to continue and the advisers do not agree to refund our money AED 25,000.

Request for your assistance and help