I was with Bulb for 2 months at £100 per month then they suddenly raised my DD "minimum" to £154 pm with a "recommended" figure of over £170 per month. When I queried these figures I received a standard reply where they made no serious attempt at justifying the excessive increase other assuring me that their figures were based on ensuring I did not accumulate a large debit balance by the end of the 12 month period. Sent 7 years worth of KWH usage figures (Gas and Electricity) to them and in addition (by way of example) chose the highest annual usages during those years (for G & E) and then applied their 2 rates usage rate (per KWH) and daily rate (x365 days) plus of course VAT (5%). My original monthly DD (£100) was very close (the figure as it turned out should have been £101 per month). This seems a very reasonable basis for forecasting my annual costs and as a consequence a fair instalment amount to ensure that by the end of 12 months cost of energy is . Bulbs DID NOT REPLY to my factually reinforced query. Consequently I stopped my next DD (as they had already indicated that this would have been at THEIR excessive rate) and surprise surprise following this they contacted me and threatened me with an admin. charge if I did not make that next DD payment. They simply did not respond to this customer when he presented them with overwhelming evidence disproving the necessity of excessive hiking my monthly DD. Very worrying and unprofessional attitude. Interesting too that on their website "chat" section other customers too are expressing their dissatisfaction with Bulb's "hiked" DDs for the same reason as mine. Something is very wrong here - perhaps a case for the watchdog?