As a consequence of the increasingly large number of gittin that are invalid according to the Torah, and are causing adulterous relations and increasing numbers of mamzerim, we are publicizing the problem in a letter from a beis din which clearly states the halacha
Concerning get me’usa (get which is invalid because of improper pressure on the husband)
It is a clear and unambiguous halacha that a get with is given because of force - that is not authorized by the Torah – is invalid according the Torah. Therefore a woman who turns with various claims against her husband which are invalid according to the Torah such as monetary claims, maintainance, division of property etc., and in exchange for dropping the demands the husband agrees to giver her a get - that get is categorized as one that is suspected of being invalid because of unauthorized force as is explained in Piskei Teshuva (E.H. 134:1) based on the Rashbatz. Similarly coercing a get by means of physical force against the husband or threats of imprisonment – also invalidate the get as is explicitly stated in the Rashba (2:240) and other Rishonim.
Therefore a woman who receives an invalid get by means of coercing or threatening the husband - in the manner listed above as well as other similar pressures – is prohibited to remarry and she needs to receive another get.