Standard Bank mobile deactivated my sim without notifying m

Standard Bank mobile deactivated my sim without notifying me and this is the number that is linked to my banking as a secondary number i have been recieving notifications of another account on the number up to the day they bloacked me. I am so frustrated at this point as the services they had promised me as a prestige banker didnt come as they promised, which i ended up converting the line to prepaid. at this point i have lost the number that i have used for more almost two decades. this is the number that is also linked to many other OTP. The least they could do was to notify me before taking the drastic step to deactivate my number. if i had known i would not have opted for their service. At this point they cannot even refer you to the service agreement that they re**** on to deactivate my number.