DOH!!!
My visa applications have been returned today..

....
Maybe someone here could give me a few pointers?
I have just emailed them to explain to me what I did wrong:
Dear Sir,
I posted mine & my 12 year old son's Visa applications last week, and they have been returned today.
I enclosed our passports, 2 photos each, 2 hand-written application forms, 1 stamped self-addressed special delivery envelope, £80.10 in postal orders (£30.00 x 2, £9.05 x 2, £1.00 x 2).
The printed sheet you sent back with my applications has:
Number 2 highlighted - incomplete fees, but i sent a stamped self addresses special delivery envelope (which it has been returned in).
Number 3 highlighted - recommend you complete application online.(I was unable to do this as my printer at home is not working)
Number 7 highlighted - Applications under 16 needs both parent's passports and a letter of consent? (I am not in touch with my son's father at this time)
Number 7 highlighted - Request you send £7.40 to cover postage for 2 passports that have been returned? (they were retuned in the stamped addresses envelop i sent)
I am confused, please could you let me know what I should do next?
Many thanks