UK Standard Visitor visa refusal. Should I reapply?

I applied for a UK Standard Visitor visa early for my seven day trip from April 26th to May 3rd 2017. I applied four months in advance (on 23rd of December 2016) and received the result after four working days. It was a refusal due to: (picture attached)

My concern is that I did submit evidence about my educational status (Student verification from university, Absent leave letter from university - both are verified and translated into English) - but in the pack of documents they sent me back with my passport, I COULD NOT FIND THEM. I suspect there might be some mistake or maybe they took them out on purpose, but am for sure they were in my application when I submitted it at the visa centre.

FYI, my status is:

I am a student (sophomore - in my second year at university).
have not much income.
my sponsor is my uncle who is so close to me because we were living together for nearly 15 years. My uncle owns a company on his own and gave me 9000$ for the trip. (However, there is no evidence of his income nor letter from him in my application).
I provided my mom's incomes as well (1100$/month).

Can anyone give me advice: Should I apply or what kind of document should I provide them to make myself become more convincing?

Because I can't file an appeal there is almost no way for me to find out what happened with the papers from my university :( enter image description here

I am going to send a complaint to VFS centre took over my application via their website because it seems to be the only way to do it. Any advice on the complaint?

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Can I apply for UK visit visa after refusal?

Can I apply for UK visit visa after refusal? You can apply for a UK visit visa after you have been refused, although you will need to address any reasons for refusal by way of additional information, explanation and evidence.

What are the chances of getting UK visa after refusal?

The current refusal rate for UK visa applications hovers around 15% mark, with some categories experiencing an even higher rate of refusals. The most notable example is a now-closed Tier 1 (Entrepreneur) route, where the refusal rate was around an astonishing 50%.

Can I reapply if my visa is refused?

Yes, you can apply if you have detected a mistake in your visa application. However, a country's immigration department may ask you for the copy of your refusal to enter the country before giving you the permission to reapply. If the reasons for the visa refusal are satisfactory, you will be allowed to reapply.

Can I appeal against UK visitor visa refusal?

A UK visit visa refusal is not an appealable decision. This means that you cannot challenge it by way of an appeal. However, if you have ever been refused an entry clearance as a visitor you have the option of re-applying or submitting an application for judicial review.

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Markus Winkler, John Fisher, Pixabay, Mike B