Worst credit account you can get

I opened a TFG account to build my credit score, my very first credit account. 1st month I bought something through the account and asked for the balance to be set up on the 6 month interest free plan, the lady at the till said they couldn't do that as the account was new. I paid the balance off before the end of the month, this should've have reset my balance to zero but there were hidden charges that none of the call center agents could explain, so the account was not on zero even though the WhatsApp chat bot clearly stated that the account balance was zero all of this I would only find out after making in query on the second month of owning this account. In my second month of having that account I got a phone and insured the device through TFG whoever did the insurance insured the device twice and put the device insurance on the 12 month plan that incurrs interest instead of a 6 month interest free payment plan. I logged a query as soon as I found out, the agent that answered the call said he would remove the second device insurance, refund the money I paid for the insurance and that he would move the plan from 12 months to 6 months. On the third month there were more hidden charges on the account, I queried again and found that the person who transfered the insurance from 12 months to 6 months left the 12 month plan active, they didn't cancel the second device insurance and they only refunded 2/3 of the second device insurance. I called again to find out what the problem is and the agent had no explanation she said she'd put me through to the insurance department but everytime I have called and been out through to that department they drop the call. If anyone has experienced something similar to this and taken this company to task please let me know, and for those of you thinking of opening an account with them, DON'T