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Most likely a scam, if its important then they will call again, so just ignore it.
It might be important so I thought it worth telling you that appears to be a company called Careline. Of course, they might just be trying to sell you something so it's up to you to judge whether to call them back.
There's no harm in returning an unrecognised call provided that you dial 141 before the number to withhold yours in case the original call was a scam.