h1b transfer very tricky question

[xatern]

Here is the summary

Type of company - Consulting with Direct Client.

Lost contract on - 28th September ( have payslip for month of September)

Current Status - On Loss of Pay for October

- Sent a mail to my HR saying that I would be on Leave(Heard it is legal)

Got new job on - 12 october (Full time in fortune 500 company)

Filed LCA on - 16 october

LCA Approval - 24 october

H1b transfer filed- 24 october (On premium)

Receipt Date - 25 october

Center - Vermont

State - Massachusetts

Problem summary:

On the last payslip , they have deducted $400 , mentioning that it is for advance they paid me before(Paid around 6 month back in cash).Would it cause any problem during transfer?

Company is asking me to join them immediately , as we already received the receipt.I understand that if I join the new company , if transfer gets rejected , I would be out of status.But if I stay back in the same company , I wouldnt be get paid for this month , unless I resume working after getting new contract , I would be considered out of status.

What you think I should do ?