Upvote:5
You should read the information at Should I submit bank statements when applying for a UK Visa? What do they say about me? Because reading your refusal letter, there are significant issues with your finances, and I wouldn't reapply until you can straighten that out, legitimately, and apply with bank statements that show a stable and coherent financial history.
What they're looking for is an organized set of financials where everything makes sense. You say that you're an employee earning £759/month, they expect to see payslips that show around £759/month, bank statements that show deposits of around £759/month, tax paperwork that shows around £759/month, etc... None of your numbers add up; your payslips, bank account, and tax papers all say different things. If you own the businesses, you should provide the documentation for that, but you need to be able to provide a coherent explanation for how much money you, personally, earn, and to be able to prove that with the documents you submit.
Frankly, that you have one month's salary in the bank and plan to spend most of it on your trip is concerning.
I am also confused about how you are supporting your sister. Your application says your sister is paying for your trip. But your question here says that you are supporting your sister financially. She's sponsoring your trip, but you just gave her around three times your monthly income to pay for your own travel expenses? That's just sponsoring your own trip, but moving money around for no apparent reason. None of this makes sense.
Also, this:
How much will they be paying towards your trip (in GBP £)? SPONSOR
Makes no sense. They want to know how much your sponsor will be spending for your trip, as in an actual amount of money.
You can apply again at any time, and pay for priority service if you wish, but as the refusal letter says: "you are likely to be refused unless the circumstances of your application change."
You can make your next application for a shorter trip if you wish, though that won't solve any of these problems. In general, I would stick to the itinerary provided with your visa application, even if the visa is issued for a six month period. We've seen people be refused future visas if they stay significantly longer.