Contact the buyer and let them know that as per your previous conversations you were expecting 25 words per file but now it is actually 70 and that you will be sending an updated offer.
If you go to the order itself at the bottom there is a feature called “Offer More Extras”. Click on this and add the additional money you would like to have.
If the buyer declines. Then you have the choice of no longer working on the project and sending him $25 of work that you have completed. Close the order and send what you have completed.
It is important that you communicate everything that you are doing. This way if a dispute arises with Customer Service or the buyer is asking for his money and wants to cancel the order, you can show that you have been in communication with him and told him everything that is going on and what steps you are taking.