Endless problems no customer service

I have the biggest headache dealing with your call centre agents at 9 this morning I called because I want to change the number that is linked to my Game Store card app I was told I have to verify that I am who I say I am and would be sent a link. The agent said the system was slow and she would call back but till now she hasn't I had to keep calling back after 7 calls and not getting any help or call backs I was able to do the verification but ran out of airtime. Called back again and was told I would have to start this process all over again because even though I did the verification and it went through it isn't picking up on the other side I would get a call back it's now 15:30 but still nothing.