Renault Clio: Remote control/plip no longer works

Hello, I have the following problem at the moment: My remote control for my Renault Clio II (year of construction: 1998, 75hp, 1.4L cylinder capacity) doesn’t work anymore. I tried it with a new battery, but it worked two times and then it didn’t work again. Now to my question: Can you fix the remote control again (it went back for a short time)? Or should I buy a remote control on eBay or anywhere else (they’re already with radio)? The Renault spare parts find a little expensive…. Thank you for your answers