This is unfortunate to hear. Rallye BMW has only offered me top-notch service, so I'm not sure what's happening with you.
For the record, the Comfort Access keys are NOT rechargeable -- only the NON-CA keys will recharge when plugged in to the key slot. If the battery dies, you have to replace it.
E92 328xi | KW | AA | LUX | OEM 359M | BMW Performance Exhaust