Director resignation

if Director Filled DIR 11 and Also sended letter Via Courier and Company Not Willing To Fille DIR 12 Then What to Do.  Is resignation not going to accepted if Company not Fill DIR 12

Dear Nitish,

As per Section 168(2) The resignation of a director shall take effect from the date on which the notice is received by the company or the date, if any, specified by the director in the notice, whichever is later......

RESIGNATION ACCEPTANCE LETTER BY COMPANY IS TREATED AS EVIDENCE OF CESSATION