Disgusting non-service for overcharge

In November 2017 and again on 23.6 2018 My account was charged with over a hundred SMS's each apparently done within less than 2 minutes to 4 different Numbers, local and overseas, a total number of 26 (Nov) SMS's to 4 different numbers and 32 each x4 in June to unknown overseas numbers. I raised the issue every time , then after weeks, it was confirmed that those numbers and charges were correct - I reported them to the ***** dept - they came back with the same replies - they don't seem to even read the mails total disrespect for their customers. I had to pay those fees as when they threatened to cut off my account . I believe it is a fault in their system, but they wont even check out the account. I am totally disgusted by their replies as they have not even addressed the issue.