Edgars account problem

On 29 October 2018 I went in to Edgars Cape Gate to pay my account. After my payment I saw that the amount left to be paid is not corret becuase I know for how much I bought and what I paid already. I went to the accounts desk to enquire about my problem. After I explained my situation to the lady behind the counter she checked on the system and told me that I have got a 12 month account instead of a 6 months account which I app**** for. Donnay behind the counter printed a statement and that is when I saw numerous extra charges which were added without my consent. Upon enquiry I was told that the charges were as a result of the fact that the account was a 12 month account. Nobody was able to assist me with answers to why it was changed from 6 months to 12 months. I then requested to see the original form which I completed as proof that I signed for 6 months instead of 12 months. No one could assist me and then I was past on from one staff member to another. I eventually left the shop becuase they were wasting my time and were not able to give me answers. I never had a good experience ever in my life before at any Edgars branch. If this matter isn’t resolved I will take the further action until I am satisfied. This is shocking service!