10 Months And Still No Cashback

[#1]

I joined plusnet 10 months ago and they still haven't paid me my £50 cashback. I've made 12 phone calls and each time been told it will be dealt with. Well it hasn't and I'm still waiting for my money. It feels like Plusnet are lying to me. Can someone from plusnet please help?

[#2]

I've checked over your account and it doesn't look like you signed up on a cashback offer. There is also a ticket on the account from 16/06/15 confirming this unfortunately is the case.
I am sorry to say that your account is not eligible for cashback.