i need some suggestion, I send my application for extension under Tier 1 genera category on 30th Jan. My mistake it was sent by First class post in UK instead of registered post

i am getting concerned as the fees is stil not payed from my account, normally it gets deducted with in 2-3 days. is there any one who applied at the same time?
is there any way i can check with HO if they have received my docs. i am not worried about delay in extension but all of my original documents.
please help. thanks
Saurabh