You would not get banned for that.
Bungie investigates accounts before they hand out any restrictions or bans. After investigating your account, they found a reason. They will not respond or remove this ban. On the very rare occasion they do respond, the answer will give a date and a very brief reason which will be one of the following below.
1. Cheating
2. Any software being detected by Destiny while it's running. These could include Trainers, Aimbots, Auto-fire, Mods, Graphics Hacks, anything that injects code into games.
3. An unstable connection is having an impact on other players.
[url=https://www.bungie.net/7_Destiny-Account-Restrictions-and-Banning-Policies/en/Help/Article/11929]RESTRICTIONS AND BANNING POLICIES[/url]
You agreed to the license agreement.
[url=https://www.bungie.net/7/en/Legal/SLA]Agreement[/url]
English
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I didn't cheat in any way, the only thing i did was to refund and they banned me after that. If they don't respond how am i supposed to contact them?
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You do not get banned for getting a refund. You did something before that.