Stor-Age Gardens doing double deductions per month under different names and won't correct it

Great facilities but non-existent customer service and ***** accounting. Since August 2017, when we moved from one storage unit size to another, Stor-Age Gardens have been debiting my Mom's account twice a month under two different reference names. The amount debited under the one reference name varies significantly each month from R25 to R2820. I emailed them a number of times pointing this out with absolutely no response. My husband then went there personally three times over months and each time, they promised to look into it. I emailed early November twice to the email addresses Stor-Age Gardens themselves provided with no response. My husband therefore went a fourth time early November 2018 and spoken directly with the manager who said he would get back to us in a day or two. This was weeks ago. We simply want it corrected to one debit per month of the correct, stable amount and the refund owed to be repaid immediately.