Swift Plumbing - ****mers, Not VAT registered and claims VAT, don't keep to time they propose

They give a time and come very late. They just do a check and provide you with a quotation to approve, they literally just go ahead with the job and slap you with a huge invoice of which they expect 70% payment. They are not VAT registered but do charge VAT on their invoices, ****ming customers and ******** trading. Upon requesting their VAT number, I received no response. The VAT number search with SARS delivered no results.