I have proof from royal mail that they have received it. The application was sent by my solicitor on my behalf. She said she couldnt find anything on their system.
Today I received a call from UKBA to state that they haven't received my Teir 1 application. As I have prove that they have received it on 5 April via royal mail.
I haven't received any ACK letter nor any payment have been deducted. I'm not sure what to do now. Any advice would be helpful.