Change
USE (ma) alias WorkTable

to

USE (ma) alias WorkTable exclusive

I could not figure out what's wrong with the syntax in this line

delete from WorkTable inner join RecToDelete on WorkTable.telNo = RecToDelete.TelNo

I have VFP8, and INNER JOIN is not listed in DELETE-SQL command in Help.

Anyway,

delete from WorkTable where exists (select * from RecToDelete)

should work in VFP8 as well as in VFP9.