If the invoice is not paid within the period specified in it, then a warning comes in the form of SMS and e-mail. The first warning is sent 2-3 days after the deadline for payment of the bill, the second notification - on 7-10 days after the deadline for payment specified in the first warning.    In both cases, a response period of five days is provided.  If, after receiving the second warning, the invoice is still not paid, customers are selected to whom the provision of services will be suspended.  Information about the debt of such customers is transferred for processing and collecting the debt by the collection company for extrajudicial collection.