@Abdul28
Difficult to say for sure but if you receive random calls out of the blue then never give them any details the ask for because if it was from Sky they should ask you for a telephone password so give them a made up wrong one and if they continue with the call you will know it wasn't from Sky.
Did you give them any personal details and why did they say they were calling, a very well known scam is to offer you a discount which is usually an attempt to get access to your account details so they can order phones or tablets from it as per this:
https://www.sky.com/help/articles/account-takeover
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