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You may cancel your Bitdefender subscription from Bitdefender Central or by contacting Customer Support at: https://www.bitdefender.com/consumer/support/help/

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Hitbtc customer support number +1-(844)-617-9531

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HitBTC supports only two types of payment methods: bank transfer and cryptos. So if you are buying crypto using fiat, you can do this by transferring some USD or EUR from your bank account and into your HitBTC account.
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