How to force the clients to provide the things I need them to provide ?

How to force the clients to provide the things I need them to provide ?

For a very long time I'm having issues with clients who don't read the Description nor the Instructions where it's written (with red color, underline, etc) what I need from them in order to complete their order. Most of the new clients simply provide what they think needs to be provided without reading anything.

So first I have to write them a message to follow the specific simple Instructions, then I have to wait and lose time while the clock is ticking.... only to receive the proper reply much later, putting me in an unpleasant situation where I have maybe 20-30% of the specified max 3 days for a delivery. Some of course don't reply at all and I'm forced to constantly keep an eye of those orders so I could send a mutual cancellation request on time, otherwise those orders will be shown in the "Late" section which is not good for the business. Even when I do propose a cancellation, fairly often, just few hours before the deadline the client rejects the request and provides the info he was supposed to provide 3 days ago.

So because of this I spend too much time writing them messages, reminding them, waiting for them, rushing to finish their orders... a cancellation is not an option because as I wrote, they will reject it and provide the necessary info eventually.

I contacted the Staff about finding a technical way to force the clients to read the very short and simple Instructions... (a much simple version of them is written at the top of the service's page as well, just to let them know that providing URL is not enough)... but they simply pointed the obvious, which is - you can't force anyone to read anything. If I can't force someone to read the 1st or 2nd sentence in the Description, then in the name of doing business, something needs to be done. Thus, I couldn't possibly be the only one with such an issue.
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My solution would be the following:
Unlike now, each service should have a separate "fill the form" page where the clients will have to provide all the necessary details requested by the seller there. For an example, 1st field (textual) will require the URL and 2nd field (numerical) will require the current (starting) amount of particular type of social signals, and that number can be checked by using the tools written as a tiny description next to the 2nd field. Of course, there would be multiple forms of fields which the seller can choose from for his "fill form" page. I could do this with an external personal webpage, but that could cause a problem between Myself and seocheckout. Such thing will force the client to read the simple Instructions and to provide the necessary details, otherwise they wouldn't be able to place the order, because filling out the fields would be mandatory.

Any tips / solutions of yours ?