[General Maximus]

the problem you are going to have is that if it is an intermittent fault which is being caused centrally (i.e. not your equipment) then you need a lot of customers to notice their connection going down and ring in in order for one of the tech bods to connect the dots and realise what is happening. Alternatively if you do get a tech come round again, explain it to him and ask him if he could escalate it to networks and see if they can run some sort of diagnostic and see what faults have been logged which would cause the disconnects (spiking power levels).