Interest money

Q: My question relates to interest which was obtained unknowingly from my medical aids savings account. Can I use this money to pay it into my bond which generates a monthly interest fee.

Q: Standard bank charged me an honoring fee of R100 which I don't think is fair. Why would they let a transaction go through if my bank account didn't have any funds? 

I tried contacting them but they declined to reverse the transaction. I have a normal debit account. Anyways I am now due to pay them this fee of R100. Can I pay them with haraam interest money?

Q: Please advise the best ways (most recommended ways) to spend/dispose of interest money earned from a bank savings account?

Q: I have had some interest money which I gave to a paraplegic in a wheelchair at our local mosque. I didn’t tell him it was interest. I did not expect any sawaab for this. He made so much of dua for me and I kept saying آمين. 

Is his dua acceptable and is my saying آمين acceptable.

Q: Previously I should donate any interest accrued monthly. 

My father said I rather keep it because he will be buying a big property within a year or two, and we can use the interest for paying the property taxes, municipal rates, etc. which are exorbitant. 

Would this be okay - to withhold the interest for sometime with the intention of paying taxes?

Q: Can I use interest from the bank to pay for my grand kids dentistry? Their mother is single and there's no medical aid.

Q: 

1. Is it permissible to dispose of interest monies to ones helper? 

2. What are some recommended ways to dispose of interest money?

Q: Is it permissible to pay interest fees with the interest received, from and to the same party. 

E.g. A bank rewards its client with an interest % for utilising a savings account. On the other hand, the same bank charges the client an interest fee for using its credit card facility. Can the client pay the latter with the interest received? As it will be returning the same interest to the bank.

Q: I have a helper whom I pay on a monthly basis. For 1 month I was not at home so she did not come to work. However I will still pay her wages at the end of the month. Is it permissible to pay these wages with interest money as she has not worked the whole month?

Q: Can interest money acquired from one bank be used to offset interest charges on my credit card from another bank, or is it only permissible to use the interest money of one bank to offset the interest charges of the same bank?