I was writing a letter for my exam practise. I have written a sentence in this letter which is
Otherwise, not only would I have said no to the client but I also would have brought so many gifts for Janet.
Is this sentence grammatically correct? Its about a hypothetical action and a hypothetical result in the future. I will have said no in the future to my client and will also carry some gifts for janet, but as I am already commited its not possible to do so.
If this sentence is wrong can you please explain a way to write such sentences?