Alzheimer or a Skype mistake?

Yesterday i received the following e-mail from Skype:
Your credit balance has expired. 

=== What are the rules for credit expiry? ===

1. credit expires 180 days after your last purchase or action that used credit.
2. Each purchase, call or SMS message resets the expiry time to 180 days.
3. Unfortunately, if you don't use your remaining credit the balance will expire to comply with normal business accounting rules.
4. You will receive reminder emails 30 days, 7 days and 72 hours before your credit expires.

I don’t contest the rules, although I don’t think the “to comply with normal business accounting rules” is a mandatory rule, and it isn’t a very customer-friendly rule anyway. Lucky for me that my Bank hasn’t the same policy.
And it were only some €-cents left on a spare account that I only use for testing.

What is more disturbing is the “30 days, 7 days and 72 hours” reminders. I DON’T REMEMBER HAVING RECEIVED ANY REMINDERS! Alzheimer on my side or a Skype mistake? I any case there is a justified reason for concern!