Returning a fake item that was purchased while thinking that it was original

Q: I'd like to find out a masla regarding an item which was bought via WhatsApp.

A brother posted a picture of a blender in a such a packaging that it could not be seen that it's fake. It stated no guarantee nor warranty. Once the product was delivered, we found out that the blender was not original but rather a copy of the original. The advert did not state that its original neither fàke. I'd like to know if I'm obliged to take it and pay him or can I refuse him.

Farmers using the Mamre Lambing System

Q: Is it permissible to use the mamre lambing system as a farmer. Mamre intensive lambing system in simple words is a system where an ewe is required to lamb 3 times in 2 years. But to do this they have to synchronize ewes and thereafter they inject a pregnant mares serum into the ewe to induce ovulation. After this the ewe will come onto heat and will be bred with

Woman conducting online programs for other women

Q: I would like to find out the permissiblity of conducting programs online via zoom or other such medium for woman. A reputable muallimah will recite zikr, Quraan, give some naseeha, etc. These classes are only for women to participate and rules state that no men should be able to hear the female speaker. Links for online classes are sent out just before the programs so that no one besides those registered will be able to listen in.

Is it permissible to conduct such programs?

Will it be permissible for me (a female) to listen and thereby encourage to such programs?