Help needed!

I have my H-1B transfer approved for company B. Before I changed to company B, I changed my mind and decided to stay in my old company A. Do I need to transfer my H-1B back to company A ? BTW, I have my EAD approved also.

What will happend to my status if company B cancel the current H-1B? Can I still work for company A?

Anyone who knows the answer please help!!!! Greatly appreciated.

Best