Reported ***** - no answer from Discovery

I noticed a sudden 7$ deduction going off my discovery credit card on 18 February 2024. I immediately contacted their ***** line to report the incident. As I was in Germany at the time i phoned their international line but got no answer. I then phoned the local line and also got no answer. I then tried their facebook messaging service and finally got someone to ask me what the problem was. I described the problem but then had no further feedback even after requesting feedback multiple times. This is only 7$ this time but what happens when they clear my account??? I cannot understand the absolute silence from discovery regarding this and will now have to take the little time I have to complain on all possible platforms about their service until someone actually gets in touch with me