Refresh the subscription at 00.01h every 1st of the month. Secondly, return the Skype customer support telephone contact
It works better for users if the calling minutes are activated on the exact time as the new month begins i.e 00.01h on the 1st of each month.
Secondly, telephone contact makes contacting customer support faster and easier. Chatting by texting takes a lot of time, in most cases requires computer to have larger screen and typing keyboard and doesn't really capture issues as talking does.