UNAUTHORIZED DEBIT

I opened a contract with Maxlaw legal in Pretoria in Dorenkloof was assisted by lady called NATASHA which arrangement for debit date was 25th April 2020 which correspondant of agreement was sent to me. Shockingly my bank account was debited 25th March 2020 immediately I called to query the debit and was told they have system error refund will be process back me till date keep telling me they have network issue am been pushed from pillar to post no refund yet has been credited to my account. I was even threatened today by Natasha she will block my number from calling her or sending her mesaages to follow up on my refund. All the banks are working during the lockdown i do not know why it is taking so long to refund me back my money.