New cell contract keeps getting suspended

New contract from April 2015, without fail every month on the 1st of the month the service is suspended!!!! This then takes 3 - 4 days to be re-connected! This is a business phone & NO-ONE can sort the problem out. Every month we have to call & visit a store to get them to re-activate on the system!!! Last month we told them that we would cancel the contract if it happens again. Well of course, it is the 6th now & we still have no service. We are at our wits end to resolve this issue, they keep blaming the system!!! PLEASE can you assist as I am going to loose my sense of humour properly this time!