I did it in this way.. please tell me if it is ok and nothing will be broken on future
remove_action('woocommerce_after_shop_loop_item_title','woocommerce_template_loop_price', 10 );
function customize_shop_page_product_title() {
$custom = 'hello!';
echo '<h4 class="product-title"><a href="'.get_the_permalink().'">'.$custom.'</a></h4>';
woocommerce_template_loop_price();
}
add_action('woocommerce_after_shop_loop_item_title','customize_shop_page_product_title', 10);