accept this challange who is php expert

we have clients base script in which 2 ways we able to set prices for user 1st one is set prices from user profile & 2nd one is make prices group and set prices for each service example one user is in reseller price group when we set prices for that user from his profile it reflect in user profile place order area after save that service price if we go in reseller group and set price for same service user not get price from reseller group user only get that vip price which we have set from his profile we want user get price from last activity if once we set any service price from user profile & after we go in reseller price group & change price for same service user get price for last one activity