UK Car Repair Questions? Ask a Mechanic for Answers ASAP
sorry to say that this will probably require a visit to the dealer to put right, or at least a Renault specialist with the dealer level tool to reset the key to match the car
what you can try though is a 'hard' reset ECU by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.
This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.
This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm