charge (v)
 /tʃɑːdʒ/ 

to demand payment

rectify (v)
/ˈrek.tɪ.faɪ/

to set right or correct

promptly (r)
/ˈprɑːmptli/

exactly at the correct time or at the time mentioned

order (n)
/ˈɔːr.dɚ/

a request made to purchase something

mistake (n)
/mɪˈsteɪk/

an action or an opinion that is not correct, or that produces a result that you did not want

impose (v)
/ɪmˈpəʊz/

to force someone to accept something

estimate (v)
/ˈes.tɪ.meɪt/

to guess the cost, size, value, etc. of something

efficient (a)
 /ɪˈfɪʃ.ənt/

acting or producing effectively with a minimum of waste or unnecessary

discount (n)
/ˈdɪs.kaʊnt/

a reduction in price

customer (n)
/ˈkʌs.tə.mɚ/

one who purchases a commodity or service

compile (v)
 /kəmˈpaɪl/

to gather together from several sources

terms (n)
/tɝːmz/

the conditions that control an agreement, arrangement, or activity

hard copy (n)
/hɑːrd ˈkɑː.pi/

information from a computer that has been printed on paper

approximate (a)
/əˈprɑk·sə·mət/

almost correct or accurate, but not completely so

discover (v)
/dɪˈskʌv·ər/

to find out about something; to find some information about something

invoice (n)
/ˈɪnvɔɪs/

a list of goods that have been sold, work that has been done, etc., showing what you must pay

form (n)
/fɔːrm/

a document printed with spaces in which to write answers or information

fill (v)
/fɪl/

to make or become fuller or full; to use empty space

blank (n)
/blæŋk/

a form that has spaces to write in, or a space on a form

tax invoice (n)
/tæks ˈɪn·vɔɪs/

an electronic or paper form showing the VAT that a customer has paid a person or company for goods or services