@Julie1213
You can't swap it but you can return it as you are still in the cooling off period of 31 days. When ordering the pro max you will be credit checked again. To return it you would need to call Sky.
150 is the free number to use from a phone that has a Sky mobile sim in it or Sky Talk phone otherwise under "Need more help ?" link at the bottom of the page on this link is the number to call Sky on:
https://www.sky.com/help/home
Try saying nothing when spoken to by the bot.
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