Hi Tunes
Your voltage is definitely an issue as your voltage should be close to 230 volts on average not 215 volts. I worked for Eskom and whenever we installed transformers we had to ensure the voltage was as close as 230 as possible generally between 228 and 236.
If your voltage is low then your dimmer lowers it even more your lights will battle to function.
I read that when the counsel stepped up your voltage it helped with the lights that in itself is an indication of the issue.
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