create error handling ability on recharge

***Errors Possible***
- Reference is non numeric (6017).
- Reference is not unique (6016).
- Network Code, Product Code and Denomination is invalid (6020).
- Unrecognized network code (6012).
- Unrecognized product code (6011).
- Recepient MSISDN is non numeric (6013).
- Recepient MSISDN malformed (6014).
- Token time out (889)
- Token is Invalid (887)