Struggling to cope with a problem on their side

I have been struggling to register my newborn as a dependent since November 2019. I sent in my forms to add her on the 27th of November already and never received feedback. Decided to phone the first week in January to find out if the changes have been app**** just for them to tell me they never received my documentation but it was noted on my account (why didn't they let me know there was a problem?). Sent in my documents again to which they responded that it was the incorrect format and I had to send them in pdf (note: they were in PDF the entire time). Sent them again from the computer to receive the same response after which i sent it once again encircling the .pdf extensions and didnt hear back again. Phoned in again today for them to struggle to find my corresponding email address the documents were sent from. After struggling they finally registered my daughter but gave her a 3 month waiting period and when asked why they said I didnt register her within 30 days from birth but all my documents were signed and sent in november with the november reference number and everything. I'm not even going to try to go on about trying to change my plan (which has also been a fight since November)