Why I can’t cancel or remove my payment plan?

Are you referring to downgrading your iCloud storage plan? If so -- Downgrade your iCloud storage - Apple Support. Otherwise, I'm not sure what you mean by canceling or removing your payment plan.

I need to cancell this auto order as below , thank you for your help .

Regards

AVG eCommerce CY Limited -《Yearly Mobile-Only Plan》(1 年) - 由 2020年07月12日起，每年 HK$ 158.00。

Tencent Technology (Shanghai) Co., Ltd -《3个月微云超级会员自动订阅》(3 個月) - 由 2020年06月19日起，每3 個月 HK$ 63.00。