辭職問題 (notice)

如你所講一月前遞信，現理應生效，但現在已經過了半個月，這與你的辭職信生效日期不符，這足可証明你已接受公司的挽留。但如果你又要半個月後走，就要再遞辭職信，並補回半個月代通知金，因不足一個月通知期，否則你去到勞工處都是理虧的。

the questions here are :
1) have you been transferred out? or
2) are you still working in same department? or
3) have you accepted the offered, i.e. transfer to other department?

If you have accepted the offered, by now you should have received a notice from the HR about the effective date of transfer and you probably got to go through another few months probation period in the new department.

If you are insist to resign, then you should consult the HR, do they require another resignation from you again as they need to calculate your salary etc. Normally HR won't ask the staff to compensate the Company, but for your case, you are advise to double check with HR dept.