Offering unnecessary discounts and making you pay later

I received an sms a week ago advising me to pay R360(don’t remember the exact amount), I phoned in to inquire about this and I was told to ignore the sms as my subscription was R105 and that’s the amount I had to pay, which I paid on the 1st August.

Today my service are suspended, I also received an sms saying I need to pay R292.63, I phoned in and spoke to ......, who told me about discounts that you mistakenly provided me ,she called them unnecessary discounts.

Why must I suffer for you mistake, I did not ask for discounts, I don’t remember any service provider reclaiming discounts they willingly gave their clients back, it’s the first I hear about this. I did not have an issue with the package I had. So either you reconnect or I am contacting the ombudsman, it is not fair what you are doing to your client. I am not what to call this, false advertising or what but it’s very wrong.