I am being charged by Ummaland and Live Book Academy separately. So I am confused which one is for understandquran.com.
Both enable access to understandquran.com, but when you are being charged through Ummaland, the access & payments will be handled by them, and they will support you with any issues you have.
It seems you have purchased subscriptions from both service providers, and to avoid this confusion further, you can cancel one subscription, so you will not be billed twice.
If you are willing to go with Live Book Academy which is handled by understandquran.com, then please check with the subscription via PayPal to ensure that you have an active payment plan. Thereafter, you can contact firstname.lastname@example.org requesting for cancellation.
If you are willing to cancel the subscription on PayPal, then you can cancel on your own by following the instructions here.