I’ve had the same problem. Twitter team not able to help and live chat took three attempts as kept disconnecting and they could offer no solution apart from an offer that was twice the price!
this is the message i keep getting
Well, this is embarrassing… We're not sure what happened there.
I’ve been having the same trouble and keep getting disconnected. One person refunded me my monthly price (as I had to pay the full price as the discount wouldn’t work) then was told to buy another pass and I would be refunded the 3 months worth to then be disconnected again!
I have just had the same problem with a cinema offer -2.40 for 3 months. It wouldn’t go through on the system and live chat were unhelpful and blamed a system error in the pricing that they wouldn’t solve saying I’d had the offer-I asked why offer it again and they ignored the point.