How to add Line Rental Saver

[#1]

Has anyone else had problems trying to add Line Rental Saver to their account ?
I renewed (upgraded) my plusnet contract within the last month of my previous 18 month contract, and was told that I would be able to add Line Rental Saver once my next bill came (ie once my new contract had started). When that bill came, no such option was available and so I rang Customer Services, who were unable to do it either, but told me to try after my next bill came, and in the meantime, they would credit £2.50 (ie the minthly saving) to my account (- they didn't !).
My next bill has since come, and when i try to add Line Rental Saver, all it tells me is "You need to have an existing Plusnet phone service to take advantage of Line Rental Saver."
Well believe it or not, I do have an existing Plusnet phone service !!
I've tried contacting Customer Services, but they are unavailable.

[#2]

Sorry to hear this.

From what I can see this is due to your phone showing as inactive on our end.

I've raised a task to the relevant team and once it's been corrected you should be able to renew your line rental saver