Customer service is full of lies and putrid!

I have bought a voucher to load on the account which firstly says invalid, I have tried getting hold of service department via telephone and all the lines don't connect, I have tried whatsapp nothing and eventually after saying on the live chat for 10mins I get a response, agent asked for details and said someone will phone back and left the chat, I have waited for a response via Telephone and still nothing, I have used the email line and it's more difficult than a thing else to get ahold of.

Want to be the biggest online provider but can't get simple customer service right.