You already got it.
You should contact Service Desk, to explain their reasons about this decision.
I tried to write to the service desk and the only answer I received was: the CENT trading accounts are free and cannot be paid.
YOU didn't do anything wrong, this was a shift in signal policy by MQL5.com in general for protecting potential subscribers (I imagine), since cent accounts are not considered standard accounts for investment purposes, but test accounts for trying different strategies and/or understand the way markets work, without risking much money.
You already got it, twice.
Switch to a standard account if you want to continue a signal.