Useless call centre agents

I made an online purchase and my details couldn't be verified. I phoned customer service. First they tell me there's nothing wrong with my account. Then they have network issues and I should try later again. Im having this problem now for a week. Oh no, sorry there's a block on your account. They put me through to the ***** department just to tell me the details on the system is not the same as what I'm confirming over the phone. For the life of me. I went to Edgars Menlyn, gave them my ID and 3 signatures to update all my details. Menlyn confirmed everything with customer service over the phone etc. Now all of a sudden, nothing has been updated. I'm fedup with your **** service and people not doing their work. You just don't listen to a customers frustration. I'm not interested in listening to your *********** call centre agents and expect a call from a senior person to at least try an resolve this mess.