Please see on the old file CAT tab and check, did CAT use to bill to Dell for the tel no. that you think it’s new no. or not ?
You can see that the monthly invoices that CAT bill to Dell is not equal in every month some month 5 no. some month 29 no.
The services that CAT provided to Dell is International call for 009-xxx-xxxxx.
For international call for Dell Thailand office, the main service we using now is True 006-xxx-xxxxx which it will be billed by TRUE INTERNATIONAL COMMUNICATION COMPANY LIMITED
I think it may be because employee can’t make a call tru TRUE 006 so they try to use 009 (services by CAT) instead so CAT billed to Dell.
About the contract, my side don’t have and didn’t keep it at my side but I can say that there is no new revised contract.