A HIGH R100.88 PENALTY FEE BY VODACOM

I have a very serious problem with Vodacom. When I was offered a contract by Vodacom, they consultant failed to disclose to me that Vodacom charges a R100.88 penalty fee for a bounced debit order. Now Vodacom has locked my phone for a R100.88 I refuse to pay as I never agreed to be charged such a ludicrous amount of money. The reason Vodacom does not disclose this fee when one takes out a contract with them is because they know no one will agree to such an amount to be charged as a penalty fee. I have raised my concerns with different consultants at Vodacom but with no solution. The last time I spoke to a consultant I receiced the following sms: YOUR QUERY HAS BEEN ESCALATED TO ONE OF OUR SOLUTION EXPERTS: YOUR REFERENCE NUMBER IS: *** on 7 JUNE 2019 at 09:12. To this day I still have not heard anything from Vodacom except receiving smses that my account is in arrears for an amount of R100.80 which I dispute to pay. I want Vodacom to unlock my phone because this is affecting my business as I can't make any calls to clients or send smes. I am not going to pay Vodacom a r100.88 penalty fee, not now not ever. I will not take a fall for their tactics as they never tell a contact customer about this fee at time of taking contract. Even a Bank does not charge such a HIGH amount for a failed debit order. VODACOM UNLOCK MY PHONE AS A MATTER OF URGENCY.