Worst service ever

For the past 6 months, I've been having trouble getting the right package and for 3 months it was reverted to the old package, then I changed from debit order to cash payment, and I make payment every single month after the 15th, same as my debit order, for the past 3 months without a hitch, nevertheless today after making all the payments as arranged after the 15th, last payment made on the 22 Dec which is a payment made for January, my wifi is cut.. Apparently I have to now pay on the 1st of every month.. Which was never communicated to me also I paid for January this payment of for February. How tf can it be cut or switched off cause I didn't pay for February yet????!!? How.. I paid for January but not getting for what I paid for in January.. Make it, make sense.. And I called the call Centre, apperently no manager was there to take the call, the agent was supposed to call back it's Benny 3 hrs and nothing