it is quite common in India to pass on bugs to another. Samasung staff, either has the habit or has been guided to do so.
Usually they pass on problem to the power supply.
If they feel that power supply has the proble, it can be in one or the other case, not in all. Most important parts is, why dont they prove it that power supply is bad by replacing their own labortary tested power supply at the consumer end, may be for three or four days. to prove .