Assist with Project Management

I am looking for someone familiar with Costa Rica's local telephone provider. This person must have a land line (in addition to mobile phone). Our company has set up a toll free number and regular (toll) number, however, there is a connection problem and our customers can't get through our operators in the US. I need someone test if our phone number is properly working. In case there were issues, this person will contact the phone provider and find out what the problem and solution. The person must have a good English writing, listening and speaking skills, as well as Spanish. Some professional business experience is required. Must follow the instruction.