Urgent advice about bahria overseas extra land charges

Dear members,
Could you please answer an urgent query....

I had applied for poessession and extra land for one of my plot at bahria phase 8 overseas enclave.... Today when i visited the office they have asked me to pay £62 per square yard which is about rs10042 in todays exchange rate and can be payable in rs or gbp ... Where as i was told earlier that they charge about rs5000 per sy...

Could any one of you shed some light on it please? I shall be very thankful to you in this
Regards

Yes, for the residential it is 5,000 per sq yard. I am also paying the same.