Hi Debra123
Welcome
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work Did you send off your form with any type of 'proof of postage'? If you didn't and you have no proof that you sent the papers this is going to be difficult to challenge - particularly as your PIP has now stopped.
If you have the proof, you can ring up and ask for a call back from a case manager to explain their decision to end your claim.
If you don't have any proof, you can still ring and ask for a call back from a case manager and try and plead your case. I hope that you saved copies of everything (including the review form) so you could send it in again.
I'm afraid they do have the right to refuse and you may find yourself in the position of starting a new claim.
You could always appeal to your local MP and see if they could ring and help. Some MPs are great and have had some success in getting the DWP to change their mind in some situations.
BIS