Depending on which internet service you have, most internet bills can be paid at most chain convenience stores such as 7-11, OK and Family Mart.(Check the back of your bill to make sure which convenience stores accept payments for these bills.) They can also be paid at banks, post offices or the gas company. You can also arrange to have automatic payments deducted directly from your bank account. Payments are due within seven days of billing.
There are also pre-paid internet packages available in Taiwan, these can be purchsed from most convenience stores. Some are also availble for purchase online. (See Applying for Internet)
If you are a HiNet customer and require services:
HiNet 24 Hours Toll Free Service Line: 0800-080412