Why do I keep getting charged?!

My active tarif options are shown as:

• o2 my Prepaid Data Pack XL
• Datenautomatik loop

However, my Verbrauchs-Check shows that I have an active o2 my Prepaid S.

Last month I was charged:

• 19.99 EUR on 01.08
• 9.99 EUR on 16.08
• 15.00 EUR on 21.08
• 19.99 on 29.08

Is this correct?

• 19.99 EUR on 01.08 <-- Prepaid Data Pack XL
• 9.99 EUR on 16.08 <-- Prepaid S
• 15.00 EUR on 21.08 <-- Loop
• 19.99 on 29.08 <-- Prepaid Data Pack XL

If so, please cancel my Prepaid S! And can someone tell me what I'm paying for with the loop???