Your deposit may still be missing in your account due to the timeframe needed for it to be reflected. It depends on your payment provider and can vary.
If you didn't put your Trading 212 account number on the bank transfer documents, you can send us a bank statement here with information about the transaction to speed up the process. Your provided bank statement (payslip) should contain your full name, bank details, date, amount and beneficiary name.
The payment should have been made from an account that you are the holder of. If this is not the case, please consider checking this article.