Jeweller selling one's jewellery without permission

Q: I went to a jeweller with some items of old gold jewellery to to get new jewellery. He gave me 2 options:

1. He melts the old jewellery and makes new ones and I pay him for his labour.

2. If there is some piece of jewellery which I like, we can swop the both.

I told him give me some time to decide. In the meantime, he sent me a picture of an item which was also gold which I liked, so I told him to please keep it for me and I will come to his office and we'll make the deal.

When I finally go there, he informs me that in order to keep that item for me, he had to swop my jewellery for it. This was done without first asking me and without my permission. So now my jewellery is gone and he tells me I must take the new item. I asked him regarding the difference in weights of the two as both were gold. His reply was "the difference was very small, don't worry about it".

My problem is that I understand that him doing that straight swop was not permissible according to shariah as gold for gold must be exact and even a "small difference" is not permissible. But now my jewellery is gone and cannot be retrieved, and I'm left with no option but to take this new item. What do I do in this situation? Will I be sinful for taking this item knowing that he got it through a riba transaction? And if I don't take it, I will lose out as he wouldn't pay me for my gold.

Also, with regard to the difference in the weights, I don't even know which was more or less as he wouldn't tell me clearly (although it seems to me that mine was the more).

Playing a recording of the Quraan Shareef in the house

Q: For a very long time we used to hear noises in the house at night. We would hear people walking up and down the stairs, down the corridor, chairs moving and the bathroom taps open at night. Even some that would visit could hear the sounds. We would get sick very often but every time we went to doctors and did various tests it would all be clear. Nobody could tell us what was wrong with us.

From the beginning of the year we started playing Quran Sharief in the house in the background 24/7. Ever since, we haven't had any issues Alhamdulillah. We stopped hearing the sounds and our health has been better. Alhamdulillah Is this disrespect to the Quran Sharief?

Accepting an invitation from a person who works in a bank

Q: My cousin use to work in a bank. His job is in CAD department that verify's that if the customer applying for the loan could pay back to the bank. And after verification, he shares his approval with the loan providers in the bank.

My question is, since I and my family has a very close relation with them and they sometime invite us for dinner, lunch at their home. Is it halaal for me to eat from them considering my cousin is the only earner in their home?

Assisting one's sister with zakaat

Q: My sister has separated from her husband. She and her three kids are living with my brother and his family (i.e. wife and two little daughters) in one bedroom appartment in London. Her husband has not yet given her divorce but also does not pay for anything for the kids either. She herself is not working at the moment. Can I pay my zakaat to her or it will only be considered as sadaqah?