India Post — crediting of cheque into sbi passbook

Address: Bellary, Karnataka, 583101

I have give a cheque to credit it to my post office sb account. Amount has been debited from my pgb bank but the has not yet credited to my post office sb account, i have enquired in the post office what is the reason behind this, they have sead that it may take 15 days to credit it to your account. It's a mear shame on the part of so far called the great indian post service that takes 15 days to clear a single check.