The popular Moravanka brass band performs at the fair. Vasek Pivoňka, the bandleader of the local brass band Kulatěnky, which broke up, decides to put the band back together. The village musicians are sceptical at first, but later they start rehearsing with vigour. Standa, a Prague resident who is working in a pig farm to cure his nerves, helps them to organise the concert. He really likes Evica Kocourková, but her father keeps an eye on her. Young Šišák tries to charm the teacher Olina. Before the performance can begin, the band must succeed before the cultural committee. However, they fail to do so. The disappointed musicians play for themselves at the station and suddenly they are successful. Standa comes up with an idea how to push Kulatěnka through without the permission of the commission. A concert of Moravanka is being prepared in nearby Nechvalin.

The eponymous debt collection call center’s marketing slogan is taken to its extreme, depersonalized operators are roused from their lethargy by unbridled laughter. Not mockery, but pure, contagious laughter at the tragicomedy of trapped debtors, its echo tearing apart the operator’s apathy and the walls of the claustrophobic open-plan office.