Bad service

I app**** for fibre. Made the payment on 26/02/2022 as instructed as you have to make the first months payment in advance as the installuon is free. The instalationon was done on 29/03/2022 and the line was active on 31/03/2022. So far so good. Then on 01/04/2022 they tried to debit my account for the payment again. So why pay 2 month for 2 days of usage. Then this morning 03/04/2022 the router went completely dead not even a power light on. Worst service ever as they can not tell me when this will be sorted