MTS.Krasnodar: even on an advance payment you can get an account for thousands of rubles. Do not believe? The court will assure you!

I was surprised by the case with a relative: it would seem nonsense - a prepaid tariff, suddenly in the morning the phone is blocked, an invoice in the cabin for the amount of more than a thousand rubles is presented. (commercial services - followed by “sex-by-phone” or something similar). Next - the theater of the absurd - MTS. Krasnodar sues and wins it. When asked about the prepayment limit, it is said that there was a technical malfunction and therefore the connection was not interrupted after the end of the finances of the subscriber. The court makes a decision - the subscriber is guilty, is obliged to pay all costs (3-4 tr).
How to be The lawsuit is on appeal, there is a statement in the prosecutor’s office ... but it seems they can’t be punched. Any ideas? Error or divorce? Why is the court on the technical errors of the corporation or is it a systemic failure against the "small" person?
PS Just do not la la, the subscriber is an elderly person, a pensioner, grandfather ...