八用達通增值 , 用英文點講 ???

增值八達通
Hey/Hi, XXX(賓妹name),Can you help me to recharge the octopus for ($100/50) one hundard / fifty.Thank you!

增值八達通 in 7-11

Hey/Hi, XXX(賓妹name),Can you help me to recharge the octopus for ($100/50) one hundard / fifty in seven-eleven.Thank you!

增值八達通 in macdonald

Hey/Hi, XXX(賓妹name),Can you help me to recharge the octopus for ($100/50) one hundard / fifty in macdonald.Thank you!

There is not enough credit in the Octopus Card, Can you help me to pay in more credit for me?
Or
The Octopus Card has run out of credit, could you pay in more credit for me, please?

Please go to recharge the Octopus card.

deposit $xxx into octopus card

Please go to recharge the Octopus card.
(最簡單直接) :請去増值八達通卡‧

Please go to recharge the Octopus card at 7-11.
(包括地點)請去7-11增值八達通卡。

希望能幫到您。

In UK, I would say: Do me a favor to top up 100 dollars please.
In HK, maybe : Do me a favor to add value 100 dollars please.