very unprofessional company

i have a contract with this company called Ismart and is ended in October 2019... i have been reporting a simcard that is not working since May 2019 and i have been taken from pillar to post whereas debit orders have been going through up until i told them i am going to stop those d/o up until my problem is sorted, up to today nothing has happened to my sim card and i have told them i thought was a network problem in the beginning i then called Vodacom an d told that sim card owes more that R9000 in arrears that is when i started being suspicious that i might have been given a sim that has worked before, i have been trying to be assisted with no luck, today they have the nerve of going into my account and take R1311 which im told is the balance of the contract , without anyy notification very funny i spoke to them on Monday 25 reminidng them of their promise to me and my data which i havent been receiving this far, i dont want anything with this company again. i need someone to explain to me as i have been sending numerous emails to CRYSTAL LEIGH to sort out this mess again in vain. i just wonder how many people have been through my situation with them