Climate defective after service at Autoplus

Hello guys, need your expert advice. We wanted to go on vacation on Saturday and therefore have another air conditioning service and oil change today. Peugeot 306 Diesel HDI 2.0 After the service the climate no longer works. If you turn it on, the speed in the stationary gas is slightly lowered at regular intervals (about 3 seconds) and again up, If you drive you even feel a delay as if you were going on the brake for a short time. a service is fixed? That’s what’s ever heard. Maybe what about the electrics? Thank you cool, by the way, it doesn’t do anymore