How to disable single.php (single view) for a specific category's posts in wordpress?

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PHP

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WordPress

I have added a section in my website where I show the logos of my customers. To do so, I have created a category named customers and have published a few posts of this category.
I don't have a problem with showing the posts (The thumbnail and the title of the post) in the website. But these posts must not have single views for 2 reasons.

1. I don't want to have a customer single page because I have no details to put there.
2. This will affect the website's SEO rank.

What I have tried:

I have used a code block like below to show the logos of the customers:

<?php if (get_field('website')) : ?>
    <a href="<?php the_field('website')?>" title="<?php the_title();?>">
        <img src="<?php echo $image[0]; ?>" class="img-fluid d-block mx-auto" alt="customerImage" width="200" height="200">
    </a>
<?php else: ?>
    <a href="<?php the_permalink(); ?>" title="<?php the_title();?>">
        <img src="<?php echo $image[0]; ?>" class="img-fluid d-block mx-auto" alt="customerImage" width="200" height="200">
     </a>
<?php endif ?>

I know that using the code above, will not allow the user to go to the single view of the customer by clicking on their logo (the href a the a tag refers to the customer's website which is a custom field; not the post's url) but as I will have a category page where I'll show all my customers, the single.php for customers must be disabled.