Overcharging on Apple Music

Hello,

I've had a subscription for apple music for a while now, until now I had no problem with anything. Recently I noticed overcharging on the app and I don't understand why.

I have the family program and it's supposed to cost 30 NIS a month and all the time I've had this subscription that what I paid but in July I was charged twice for 30 NIS and in August I've already been charged twice for 30 NIS and it's only the 8th of August.

I want to know the reason behind all this and understand why it happened and make sure it will not happen again and if there is no reason behind this then I would like to get a refund.

Thank you very much,

Guy.