what are these 2 words on invoice?

[Orton Rd]

I would ask the Mrs but she no speaking, argument over air con cleaner

 

 

[DaLa]

Contact Service Department  and  Service to clean coils. Presumably the first one is like a call out charge. Hope that helps.

[blackcab]

1. Service Fee

2. Compressor

[Orton Rd]

thanks guys

[tgeezer]

It probably can mean a "call out charge, a payment for the service given if it is a small amount and nothing was signed but why would ค่าบริการ not do for that. In ค่าสัญญาบริการ สัญญา is an agreement between two parties on the handling of something from now on; Contract, promise, agreement etc.  
Ask the wife if this would have to be paid next time the A/C needs cleaning.