Activation of DSL O2 home box

Hi, I had my O2 activation date yesterday, 5th August 2021. They alloted a time slot of 12:00 to 4:00 PM. The technician did not arrive till 6 PM and later, I received an email saying that the technician will not come and that I have to reschedule the appointment. I do not know German and it was already outside of the business hours of the english customer care. With the help of a German-speaking friend, I contacted the German customer care and got him to schedule an appointment for the 6th August form 8:00 AM to 12:00 noon. However, I have not received any official confirmation about the appointment from O2. I waited the entire day yesterday and I still do not know if I will get my internet connection. It is a very frustrating experience. If anyone can help me out, it would be greatly appreciated. Thanks.