Barclays Bank — Fraud by Barclay bank

Dear All,
I requested for personal loan amount Rs:1, 00, 000/- for the interest rate of 18% from Barclays Bank, the same was signed with 18 % intrest and post dated cheques were taken from me. but later i came to know from one of there executive that my loan has been approved for the intrest 21%. As i have signed for only 18% only i rejected the loan saying it was cheating. i haven't received my post dated cheques after continous tracking with the bank executives. i strongly feel the bank is making fool of its customers and making us to run nook and corner to collect my cheques for the mistake done by bank executives.
Request you to help me to get back my post dated cheques ASAP