IHS for dependent

Hello
I applied for my tier 1 extension July 2016 (waiting for result) - did not apply for my dependents with my application.
I am trying to pay for my dependents IHS, when I choose where it says ' Are joining or remaining with the person in the UK' then takes details of my IHS number and visa expiry date (expiring on 08 November 2016)
If I fill my details the total to be paid amount comes to £100 and if I dont fill my details the amount comes to £600.
Which one should I choose? Enter my details or don't enter my details.
If I dont enter my details then the form is incorrect but the amount is correct. £600
If I enter my details then the form is correct but the amount is not correct £100

dont fill in your details. dependent should apply alone.

CR001 wrote:dont fill in your details. dependent should apply alone.

The question states are you applying to join or REMAIN with the main applicant (me)
Wont the details be incorrect if I don't fill my details

You aren't the main applicant. Your dependent is (the only one).

Casa wrote:You aren't the main applicant. Your wife is (the only one).

Confused
I am the main applicant
My wife is my dependant
How can she be the main applicant

I was under the impression that you had already applied (separately) for your Tier 1-E extension?

If not, what are you now applying for with your dependent?

Casa wrote:I was under the impression that you had already applied (separately) for your Tier 1-E extension?

If not, what are you now applying for with your dependent?

Yes that is correct
I applied in July and waiting for the result
The problem is I applied before the expiry of my visa and my visa expires on the 8th of November 2016
So when I enter my visa expiry date the surcharge charged for my dependant is partial amount which is 100 pounds

Tried everything
As soon as I put my details the amount for each dependant is 100 pounds