Car insurance wrongly calculated?

Hello together, maybe you can enlighten me. I took out a motorcycle insurance on 25.08.2015. Liability 96.50 Euro Teilkasko 79.80 Euro = 176.30 Euro per year. For the period from 25.08.2015 to 01.01.2016 an amount of 61.71 Euro was debited. This is the first amount I cannot understand! Now I moved three days later and the amounts have adapted accordingly Now it costs liability 83.90 Euro Teilkastko 34.30 Euro = 118.20 E uro in the year Now 15.02 Euro have been refunded to me with the following invoice contribution from 28.09 to 01.01 costs now 30.53 Euro return contribution from 28.09 to 01.01 45.55 Euro ================================================================= Results 15.02 Euro Insurance is the Bavarian. Can you help me understand that? I do not know how to get the best of the first amount. Then I would have cost the three days in the old residence over 15 Euro. In my opinion the first contribution is wrong Do you calculate this per day or per month? Are 30 days per month? My bill would be as follows from 25.08 to 01.01 -> 3*30 + 6 days = 96 days 28.08 to 01.01 -> 3*30 + 3 days = 93 days old post 96/360*176,30 = 47,01 Euro new post 93/360*118,20 = 30,54 Euro return fee 93/360*176,30 = 45,54 Eruo I’ll see what, or have they charged me too much at the first time. Thanks and greeting Johannes