Please also note that the intervention of one of our technician will be necessary

Please also note that the intervention of one of our technician will be necessary (and has to be paid by the customer).
这句话什么意思啊？

not noly...but also not only...but also not only but also not only...but also. not only ..................but also not only ,but also 关于not only,but also 关于not only...but also... not only but also 难点 not only ...but also 造句