RE-ACTIVE MY ACCOUNT

On 13 of december Someone mistakenly send money on my account of which is R1050.00 . I dont know the sender i don't have his contact details to reverse his money back . So this person decide to report me as like im a bad person . On 19 of december Discovery bank lock my account . I have made many call regarding this issues . I even send affidavit via email on 28 of december to prove that i didn't do anything wrong .. But still no help , Discovery Bank is not a good Bank actually ... I Request you discovery Bank to resolve this issues as soon as possible it been a long time with no help...please help me as soon as possible