So I recently came across this InfoTaKe.

Users transferring money from Equity Bank’s Equitel Mobile Money platform have been hit by a more than 100% increase in the cost of transferring money from the platform to Safaricom’s M-Pesa. 

The new charges appear to have been implemented at the start of August, just as Equitel officially announced it’s transition from a pilot phase. No official communication on the new charges was relayed to Equitel users.