Non stop calling

I went on to the hippo.co.za website to get quotes for medical aids. The next morning I got a call from one of their consultants. I was in a meeting and asked the consultant to call back the next day. About an hour later I had another call from them and it continued like that for the rest of the day. I had a total of 9 calls on the first day. The last one being at 21:00 in the evening. The next morning the consultant phones and by that time I was so angry that I told him that I don't want anything to do with hippo at all. I also asked, as I asked all the consultants to stop calling me. It is now a week later and they call about 6 times a day. Currently, I am using true caller to block their calls. Please don't make use of hippo. It will drive you crazy.