Bad clients.
No matter what reputation your establishment has, from time to time there may be bad customers. On the one hand, we all know that in the service sector a satisfied customer = at least one more order. On the other hand, you need to know how to communicate with dissatisfied customers and those who "do not play by the rules".
At the beginning of the journey, when the pizza was not yet of excellent quality (smooth edges, beautiful color, balanced taste) and could not accidentally burn, some customers called and made claims to the product. If the criticism was justified, we offered the same pizza for free as an apology or a discount on the next order. After that, customers either became "lawyers" of the institution and regular customers, leaving positive feedback, or just kept silent, even when others were dissatisfied with the quality.
But there were other reviews... Customers could pick on the stale cake (although we knew it wasn't), the thickness and shape of the cuts, the distribution of ingredients on the pizza, the sauce, which was different from other pizzerias. We can still list some reasons for negative reviews... We, of course, apologized for the "unworthy" quality and offered a discount on the next order, but the free pizza stopped spoiling. Such a client, even after receiving an apology pizza, is unlikely to order anything from you again.
Caught and phone jokers. After a while you will be able to recognize them confidently and decide whether to carry out the order or it is better to ask in advance to pay for it, referring to the high load of delivery. Such clients can easily send a courier to a false address, and then reset your calls.
There have also been cases where a customer made an order, but did not open the door to the courier and put the number of the pizza place in the black list. We immediately put such people on our ban list. Moreover, I recommend that anyone who subsequently orders a pizza at this house or at a nearby house (within a radius of half a kilometre) be charged an advance payment.
Don't worry, you'll learn to identify bad customers pretty quickly. Take the advance payment if you realize that the customer is not drunk or, in your opinion, not quite adequate. This is especially true if you order 1000 - 1500 rubles (3 - 4 pizzas). So you can protect yourself from losses.