Unauthorised Spend Limit charged

I am so angry at the terrible service that I am receiving from Telkom, I have has a LTE contract for 3 years now, my first 24month contract I took out finished in 2018 so I upgraded to the 20gig (+20gig) promotion which I now get 40 day and 40 night time data for. For the first 10 months I have been paying R369, when my data is done it is done. but since June 2019 Telkom has added a R500 spend limit to my contract without informing me. They say it is a default spend limit but I have never had it on my accounts for nearly years now so how is that default. I have never requested this to be placed onto my account and never authorised anyone to do so. I noticed it last month only because I took out a cellphone contract in July and thought that it was the pro rata from that account until last month I thought I cannot still be paying additional for the cellphone, I called in and was informed that I have a spend limit on my account which has been charging me R500 since July. I was expecting to pay R369 + R270 for the cellphone contract R639 a month which I have budgetted for but for the past 4 months my bill has been June R869, July R929, Aug 1163 and Sept 1168 - I called your cell center last month (firstly the landline you advertise on your site does not work) I had to call from my cellphone and wasted all my airtime and did not even complete the call the call center agent never sent me my bills and I still have not received a monthly statement from you as you had the incorrect email address. I went online and set the spend limit to 0 and yet I have been charged again a spend limit. I want someone to call me as I want to be reimbursed for the months you have charged me as I never authorised a spend limit on my account. I will be taking this to the ombudsman because you are a ********** company. I cannot wait for this contract to end as I will never use your services again