i'm being double billed ?

I don't know who or where to talk to - I am being double billed for PREMIUM
I had already prepaid for a year but the system did not recognize it - so I opted for the PayPal month by month until this is cleaned up 10/05/2015AirDroid Premium 1 MonthSuccess$1.9910/05/2015AirDroid Premium 1 MonthFailed$1.9907/28/2015AirDroid Premium 1 YearSuccess$19.9907/28/2015AirDroid Premium 1 YearFailed$19.9907/28/2015AirDroid Premium 1 YearFailed$19.99

I don't know who or where to talk to - I am being double billed for PREMIUM
I had already prepaid for a year but the system did not recognize it - so I opted for the PayPal month by month until this is cleaned up 10/05/2015AirDroid Premium 1 MonthSuccess$1.9910/05/2015AirDroid Premium 1 MonthFailed$1.9907/28/2015AirDroid Premium 1 YearSuccess$19.9907/28/2015AirDroid Premium 1 YearFailed$19.9907/28/2015AirDroid Premium 1 YearFailed$19.99

Hi, please contact us at pay@airdroid.com for any billing issues.

Please remember to send your AirDroid account, PayPal account that you used to purchase Premium service