Bad customer service at Leroy Merlin greenstone

I bought good at Leroy merlin Green stone and went to collections to collect my good but I waited for more than 30 Minutes while one of their employees by the name of Magdalene who works as the supply chain manager was on her phone and not assisting me. She said I did not give her the till slip. Who is training this people to handle customers? It was just me and her in the collections department! I didn't come to chill, I bought good and expected to receive assistance, not watch an employee playing with their phone.