Upvote:5
"I thought maybe adding more money to my bank statement would make it better"
This was your mistake! The ECO got you on funds parking. Which means, because you were unable to adequately support your claim that the money was indeed a gift from your father, they drew the conclusion that you merely added £2600 in order to deceive them regarding your actual financial status. This is commonly done by people seeking entry to work illegally under the disguise of visiting; after all, the better your financial status, the less likely you are to seek illegal employment abroad.
You should consult a solicitor again, be absolutely truthful in admitting your mistake, and then (with the aid of the solicitor) apply again with solid documentation proving that those £2600 were a gift from your father (a copy of your father's employment contract and bank statements that clearly show the provenance of his funds and his motivation for gifting you).