Can I be pulled over at the Beginning of a hov lane even with turn signal on?

You ask whether you can be pulled over, and then state you were. Seems like that is your answer.

In any case your lawyer is going to have much more info than we would, so we are not going to second guess them.

Can I go back to Target?

By your own post it appears you cannot go back to Target.

I can only assume the officer believed the other driver and not you.

Police rarely see the crimes they arrest people for.

Just as they can't sue you for quitting for no reason, you can't sue them for firing you for no reason.

You have to sue them in the location listed in the terms and agreements and it is likely going to cost you more than you lost.

The only way to know for certain is to be arrested and let a court decide. I am sure you don't want to do that.

Am I able to sue a jeweler for false knowledge/advertisement ?

I am not sure as to the difference in value, but a lawsuit would be expensive and time consuming.

Sounds like you should find another buyer.