Extremely poor Service. 19 days to repair a Network issue, and still not fixed.

On 5 November my troubles started. Everybody who tried to call me got the message "The number you have dialed does not exist". I could make calls in the morning, but later I could also not make calls. That evening I could again make calls, and some people could phone me. A lot of people, especially Android Phone users could not phone me. Especially Samsung Note 10 users, but also some other Samsung (Android) users. Iphone users could phone me. After many troubleshoot attempts with your callcentre agents, and even a SIM swap, as well as a Phone swap, the issue just could not get resolved. On 11 November, a person from your network department called me, and told me to check whether the Android users could phone me, as he managed to resolve the issue. They could all phone me. He seemed to have fixed it. On the very next morning, 12 November, the trouble started again, exactly the same as on the 5th November. Everybody whom called me got the message that "The number you have dialed does not exist". I reported a fault, and later I could again, also not make any calls. This was eventually "resolved" on Friday, 13 November, but since then I cannot receive calls again from any Samsung users, especially Note 10, but not limited to Note 10 users. I keep phoning every day, only to be told that the issue will be escalated, and the operator assures me how sorry they are for the inconvenience. My number is now completely off. It is a Business Line, and I cannot use it for making or receiving calls. Today is the 24th November, and I call them daily.