Complain

I hv a contract with mondo via telkom cellphone . I requested one cellphone A10 Samsung dual sim with one sim card as package. These guys did send 2 A10 cellphone with 3 sim cards. So I hv contacted them via email n requested for one A10 +2 sim card to be collected as I needed only one A10 + 1 SIM CARD as package of R219 . As we discussed mondo team terrence did reply my email to say I must courier back to there address given n they will refund my money tht I couried with I used a post office to return the parcel on the 20/12/2019 n I went back to them via email to asked them I they have received the package the said i should provide the return number from post office I did email them the return number even so they can trace the parcel even today I hv not received any response tht say they hv received the parcels then I later on the 11/01/2020 for a bill of R1422-00 but my package was R219 . I email them to check whts tht with such high bill then they responded by saying Breaking down my contract Samsung A 10 ( dual sim) on freeme 1gb (top up) @ 219+ once off activation fee of R99 Samsung galaxy A 10 (dual sim ) on freeme 1gb ( top up) @ R219 + activation fee of R99 Sim only on free me 1 GB ( top up) @ R100 PM once off activation of R99 To my suprice only one cellphone + 1 sim card of top up of R219 package was activated so y are they saying I must pay 1422 as I hv to pay R219 + R99 only not tht much Please guys help me with such situations I am in Contact number ***