Phone upgrade billing

[Lauren2212]

Hi sorry just a bit confused I did an early swap and sent me phone back for an upgrade I've received my new one and was of course expecting my bill to be higher due to having to pay some off still but for some reason my next 3 bills are saying they are £131.45 and then 2 say £130.50  is there anyway anyone can explain this tried to use to chatbot but it's just absolutely useless lol

thankyou in advance 

[PandJ2020]

I would assume your return hasn't been processed yet (takes 3-4 weeks) and the bills are for 2 phones?  What do they show?

Any shortfall in the value of the swap and the outstanding credit becomes payable in full on the next bill.