Damage to rain tanks

When installing the gutters into my rain tanks the geniuses at Gutter People cut into my 5 water tanks to install the gutters. The water tanks cost is around R22000. When complaining to Ansa on numerous occasions the standard response is that she will investigate and call back. To date not once did Ansa actually respond. She uses this as a stalling tactic hoping you will just go away. The service received from GutterPeople is poor in general and Ansa is of no help what so ever.