You are very bad. If there is no reply within this week, I will immediately connect with the credit company and request to cancel your credit card bill.
You have not responded me conscientiously at all. If you are not going to respond me within this week, I will contact the credit card company immediately, and request cancellation of the amount you requested.
Your response is quite bad. If you don't reply within this week, I will contact the credit company and ask them to cancel what you request me to pay via credit card.
Your customer service is very bad. If I do not get a response from you, I'm going to contact my credit card company and ask for declining your invoice immediately.
If there is no reply within this weekの後ろに 「from you」を追加してください。申し訳ございません。