Upvote:3
The letter you have attached doesn't indicate that you have received a ban, only that future rejected applications may result in one.
Emphasis mine:
You should note that because this application has been refused under paragraph V3.6 of the Immigration Rules, any future applications may also be refused under paragraph V3.7. A refusal under paragraph V3.7 attracts an automatic entry ban period of up to 10 years.
Your application was refused under V3.6. Future refusals may fall under V3.7, and those would attract the ban.
In particular if you do choose to submit a new application you should ensure that you not only have all of the required documentation in order, but also address the issues raised in the first refusal or you will receive an automatic ban