On the face of it, it's a missed call from a company called CCA International, one of a number selected by BT to "reach out" (yuk!) to their customers; have a look here.
Calling the number is revealing. A recording confirms that it's authorised by BT and has the nerve to say how you may (yes, may) be able to remove yourself from the calling list. In the current scams climate, many purporting to be from BT, maybe BT will explain their right to put customers on the list in the first place.
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