Joined free trial for LinkedIn subscription and after one month free trial ended and money deducted from my account and now on the same day can I ask for a refund ?

and money deducted from my account and now on the same day can I ask for a refund ?

Check your mail box, you have received an email reminder seven days before your trial ends.

So If you don't want to continue LinkedIn subscription, you had to cancel the LinkedIn subscription.

LinkedIn is a 3rd party app, you need to reach out to LinkedIn.

Read also the Notes:

• You’re required to input a credit card number to get the free trial.
• Your free trial expires exactly one month after it’s redeemed. It’ll convert to a paid subscription and your card will be charged if you don’t cancel your trial before it expires.
• Billing, cancellation, or renewal dates for free trials and billing charges are based on the date and time that the subscription was activated, in local US time zones for US-based English-speaking members only. For all other countries or languages, this is in Universal Time Coordinated (UTC).
• 👉 To avoid getting charged, you’ll need to cancel at least one day before your trial ends. We’ll send an email reminder seven days before your trial ends. If you have signed in with a Gmail account, please check the Promotions tab as a notification may have been redirected by Google. You can confirm the billing date from your Premium settings page.
• If you've used a free Premium subscription trial, you won't be eligible for another free trial for at least 12 months.